They stayed through to nearly the final hour.

  Nobody had discussed it. Nobody had made a decision, called a vote, or suggested it was the right thing to do. Vorrin had not initiated departure protocols when the documentation was complete, and nobody had asked him to, and that was that. They stayed.

  The Umara didn't know it was their last moments. That was the thing Jessica kept returning to... the extraordinary mercy of not knowing. The connector moved between its groups. The cohort tended the pilings with their characteristic deliberateness, placing stones with the patience of creatures who believed there would be tomorrow to add more. The anchors conducted their slow, luminous conversations with the ease of long familiarity.

  Just another day. The same as the days before it and the days before those, stretching back through generations she would never know, all the way to whatever beginning the cave art on the eastern wall was trying to remember.

  She stood at the art for a long time in the morning.

  The shapes pressed into the rock... the water source, the antler structures, the rows of repeated marks along the base. She'd spent two days trying to decipher them along with the ship’s computer and had gotten no further than the rough impression of meaning without the meaning itself. A language inside a language. Something recorded by someone who believed it was worth recording, which was its own kind of faith.

  She put her hand against the wall the way she had so often against the viewport glass.

  The rock was cool. Just rock.

  She took her hand away and went to find the others.

  *  *  *

  Thessarn was outside when she found him.

  Not far... twenty feet from the cave entrance, standing on the rust-colored ground with his face turned toward the horizon where the mining operation moved against the sky. He hadn't left after their conversation in the cave the way she'd expected him to. He'd stayed through the documentation. Stayed through Khamm's vigil on the cave floor. Was still here now, on the last day, which told her something she didn't yet have words for.

  She stood beside him.

  "You should have left," she said. Not accusatory. Just observational.

  "Yes," he said.

  "Why didn't you?"

  He was quiet for a moment. "I'm not entirely sure." He looked at the horizon. "Possibly because leaving felt like the wrong kind of not interfering."

  Jessica looked at him.

  "There's a difference," he said carefully, "between principled withdrawal and... simply not being present for something that deserves witness." He paused. "I've been confusing those two things for longer than I'd like to admit. For what it’s worth, you made the right decision."

  Jessica felt her rage flare unexpectedly.

  "Thessarn," she said. "Don’t. Don’t you dare right now.”

  He went still in the way he'd gone still a day ago. She'd decided then to wait. She wasn't waiting anymore.

  "The seismic signature. Vorrin traced the origin point completely before we left the cave." She kept her voice level. "It was a placed charge. Small, targeted, designed to compromise the upper passage without bringing down the whole system." She paused. "It wasn’t in the original timeline. Since you were down there with us, that leaves Rask."

  The horizon machinery moved.

  "He moved the extinction window up by six days," she said. "He contaminated the water table. He created the impossible choices we spent two days making." She turned to face him. "And then you stood in that cave and described the harm that intervention causes."

  "Jessica ..."

  "I'm not finished." She wasn't angry. She'd thought she would be, and she wasn't ... the fury had condensed into something quieter and more permanent than anger. "You believe something. A cause. A philosophy with real arguments in it, some of which I cannot fully answer and some of which I'm still thinking about and probably will be for a long time." She held his gaze.

  "But Rask is what moved into the space you made. He took your argument... that intervention causes harm, that the timeline should be left alone... and he's using it to hasten extinction. Like… he decided that if something is dying anyway, he might as well help it along." She paused. "That's not your philosophy. I know it isn't. But he's yours, Thessarn. You built the house, and he's living in it."

  The silence was long and had the particular quality of something that couldn't be taken back.

  "I know what Rask is," Thessarn said finally. Quietly.

  "I know you do. That’s the problem."

  "I have known for ..." He stopped. "Longer than I acted on it. Yes." He looked at the cave entrance. "That's its own kind of harm."

  "Yes," she said. "It is."

  He turned to look at her fully for the first time in the conversation. Something in his expression that was neither the philosophical composure she'd come to expect nor its absence, but something rawer than either... the look of someone who had been seen clearly and was deciding whether to stay seen or retreat.

  He stayed.

  "The asteroid came from the direction of the sun," he said. "Rask came from the direction I wasn't watching." He paused. "I've been giving thought to what you said while we were trapped."

  She watched him, silent.

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  Something moved across his face. "The pet argument," he said. "I've been considering that too."

  "And?"

  "And I still believe what I believe about intervention." He said it without defensiveness ... just clearly, the way you stated things you'd examined and hadn't found reason to abandon. "I think the questions I raise are real questions. I think the harm is real harm." He paused. "I think you raise real questions, too. One’s worth addressing." He looked at the cave. "I don't think either of us is entirely right."

  "No," Jessica said. "I don't think so either."

  He nodded once. Looked at the horizon one more time.

  "Rask," he said. "I'll deal with Rask. He’s my responsibility."

  She believed him. She wasn't sure what dealing with Rask meant coming from Thessarn, and she suspected it wouldn't be enough. But she believed him anyway.

  “You!” The voice from the mouth of the cave drew both of their attention as Vorrin stormed out into the open air once again. “I figured it out. Think you’re so clever, don’t you?”

  “I’ve no idea what you are ranting about…” Thessarn’s voice returned to its cold detachment.

  “Tracking us… How you keep ending up where we are.” Vorrin stalked around both of them with a glint in his eye. “Finding us after the floofs… even the snarrics you’re strategic. You could have figured out we would be there eventually, but here? There’s just no way.”

  Thessarn grinned wryly. “Oh.. So you finally caught up to the rest of the class, is it?”

  Vorrin’s eyes flashed in anger before he schooled his face once more. “I was overthinking it all this time. You stole one of the shuttles from L’askh’ennys. You’re still using it. Just using the shuttles’ return function to bring it to wherever the ship is.”

  “Congratulations… you cracked the case.”

  Vorrin stepped up to Thessarn, nearly pushing Jessica aside as he did. “Listen up, you cocky… Drop this. I’ll have Oryxx disable the tracker, and you’ll end up stranded in the middle of space in an era you don’t recognize. Don’t test me.”

  “Collapse is in less than an hour.” He addressed Jessica. “Be ready to leave.” With that, the aelith stormed back into the cave entrance, towards the rest of the group.

  Thessarn was quiet for a few moments, the faintest movement at the corner of his beak. Not quite the thing that happened before smiles but close. "Safe travels, Jessica Chen."

  He walked away across the rust-colored ground without looking back, his long crane-shadow stretching behind him in the light of a sun that was finishing its arc over a planet that didn't know what it was losing below its foundations.

  She watched him until he was gone.

  *  *  *

  They gathered in the cave for what would be the last time.

  All of them ... Jessica, Deke, Maddie, Vorrin, Khamm, who had come back down from the ship without being asked, Orryx, who rarely left the ship and had said nothing when Jessica had seen him join them, just settled his serpentine bulk near the entrance with the patience of someone who understood vigils.

  The Umara went about their evening.

  Nobody said much. There wasn't much to say that the cave wasn't already saying.

  Deke was sitting apart from the others, closer to the cave entrance than the rest. The injured Umara had drifted to within a few feet of him in the way it had been doing since the rock. Not close enough to touch. Never quite close enough to touch. Just ... present, in its particular way, its chest markings moving in that slow, steady pulse.

  Jessica watched him watching it.

  He reached into his suit pocket slowly, the way you move around wild things, and took out nothing ... just rested his hand on the cave floor, open, palm up. Not reaching. Just open.

  The Umara looked at his hand. At him. Its bioluminescence moved in a pattern she'd seen before ... the single line of light from chest to fingertips, both hands, something they couldn’t translate. The thing no one would ever translate.

  It didn't move closer.

  But it didn't move away.

  Deke closed his hand slowly, put it back in his pocket, and looked at the cave floor for a moment with the expression of a man quietly rearranging something inside himself.

  Khamm put her hand briefly on Jessica's arm. Jessica looked at her.

  Khamm's eyes were bright in the way they got when she was holding something carefully. She didn't say anything. Just looked at the cave and then back at Jessica and squeezed her arm once and let go.

  Jessica understood. Some things you just stay for.

  They left before the collapse.

  Vorrin had been precise about the window ... enough time to clear the area, enough time to be gone before the mining vibrations reached critical threshold. He'd given them twenty minutes’ warning, and nobody had argued. Nobody had suggested staying longer. They'd said what they needed to say or hadn't said it, and either way it was done.

  Walking out of the cave for the last time, Jessica didn't look back.

  She'd decided that on the walk in. She'd carry what she'd learned, and she'd carry Vorrin's documentation, and she'd carry the shape of their light-language that she was only beginning to understand, and she wouldn't look back because looking back wasn't something she could afford to make a habit of in this life she was living now.

  She didn't look back.

  She almost made it.

  At the last moment, at the point where the cave entrance curved and the light changed, and the world inside became the world outside, she stopped. Just for a second. Just long enough to see the blue-green bioluminescence moving in the dark of the cave, the patterns traveling between eleven creatures on an ordinary evening that was also the last evening, unhurried, patient, lit from within.

  The connector paused in its movement. Turned in her direction.

  A single line of light from chest to fingertips. Both hands.

  She turned and walked into the rust-colored light and didn't stop again.

  The cave collapsed forty minutes later.

  Vorrin noted it in the mission log with his characteristic precision... time, seismic signature, projected extent of structural failure, correlation with mining vibration data. Everything documented. Everything on record.

  Nobody asked him to read it aloud.

  They were in the lounge when it happened, gathered in the particular way they gathered after missions... not deliberately, just ending up in the same room, making use of the synthesizer, not quite ready to disperse into their separate routines. The chalk taste was still there, faint now, the stabilizer running its last reserves until resupply.

  Deke ate without commenting on it.

  Maddie had her tablet but wasn't typing. Just holding it.

  Khamm was sitting cross-legged on the lounge bench with her knees pulled up, which was how she sat when she was tired in the specific way that sleep didn't fix. Vorrin stood near the viewport, looking at nothing with the productive quality of someone still processing data internally.

  Orryx had gone back to the habitats.

  "Hey," Deke said to the room in general. "For what it's worth." He looked at his cup. "I think we did right. Both days. The documenting. The staying." He paused. "The leaving."

  Nobody disagreed.

  "Khamm," Jessica said.

  Khamm looked at her.

  "What you said. About them feeding the planet and something growing from them." Jessica turned her cup in her hands. "I've been thinking about it."

  "And?"

  "I think it's true." She paused. "I think it's true, and it still hurts, and I think that's the right response."

  Khamm nodded slowly. "Yeah," she said. "I think so too."

  The synthesizer hummed. The ship moved through whatever space and time it moved through between one moment and the next. Outside the viewport, the stars were the specific stars of wherever they were now, not Vethara Nol, somewhere else, somewhere forward.

  Maddie opened her tablet.

  Started typing.

  *  *  *

  From the Chronicle of the Last Kindness, as recorded by Maddie:

  Day 59. We left before the collapse. The one thing we refused to witness was the very end. Vorrin logged it at 14:32 ship time.

  Jessica talked to Thessarn before he left. She told me what she said about Rask. I'm putting it on record:

  He caused the harm he blamed us for. And Thessarn built the space that Rask moved into. That's the difference between them ... Thessarn believes what he believes because he's in pain and working through it honestly, even when he's wrong. Rask just likes the part where things end.

  Thessarn said he'd deal with Rask. Jessica believed him. I'm not sure I do, but I'm writing it down anyway.

  The Umara are in the documentation files now. The light-language lexicon Vorrin built, the cave art scans, the social structure mapping, and the stone pilings. Everything we could take.

  It isn't them. It's what remains of them. Sometimes that's what there is.

  Deke hasn't named the pattern that the injured one kept showing him. The line of light from chest to fingertips. He says he doesn't know what it means yet.

  I think he'll figure it out eventually.

  Eleven Umara. Known. That has to count.

  It does.