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Here's what lands at that console, six minutes into a building deciding to eat itself, and it arrives with the specific horrible clarity of a grammar rule surfacing partway through an exam.

The verb is not the point. The scope is.

Those four final lines carried a value ahead of the direction, and I keyed it in because it sat in the sequence, and I never asked why he'd bothered. The value read: everything, every chamber, whole. I took that for thoroughness. A man being careful.

It isn't thoroughness. It's a lock.

If you enter that instruction with a partial scope — four chambers, say, or nine, or whatever a person could reach with a gun to somebody's head — the building doesn't publish. It contains. It goes to exactly the configuration it's going to right now, sealing and shrinking, because a partial request is what a coerced request looks like, and the makers built the containment for a reason and Garrick Marlow worked out what that reason was.

He wrote the complete scope so that anybody who came after him could only ever do this all the way or not at all.

And I entered it correctly, and the building started to publish. Then a small army of armed men walked into the corridors, and the building, which has no way to distinguish a siege from a scope error, started hedging.

“It's not overriding the publish,” I say. “It's running both. Look at the transmission column — it hasn't dropped.”

“It hasn't.”

“So it isn't confused. It's doing exactly what it was told and then reducing its own exposure, and it will keep reducing until there's nothing left in reach.” I'm already reaching into the trough. “We re-enter the scope. Complete. Now, on top of the running instruction.”

“And if it takes that as a fresh request and starts again?”

“Then everything published so far is still published and we've lost nothing except my dignity.”

The scope takes four minutes to enter and I make no mistakes, and I'd love to claim that as skill.

It is not skill. It's the fourth time in six hours that my hands have done this shape and there's a point past exhaustion where the body simply carries on without consulting you, which every teacher in the closing days of term will recognize.

The isolation column stops filling.

Then, one line at a time, it empties.

“Oh, good girl,” Selka says, to a building.

Below and around us, four chambers that were being quietly cut out of history rejoin it.

What's left of the six hours I have in fragments, and I'll set them down in the order I have them rather than pretending to a sequence.

Selka on the slate with the evacuation, talking three groups through corridors that keep becoming other corridors, working from a floor plan that is out of date every ninety seconds. She does it by treating the building as a colleague rather than an obstacle: asking where it has put people, then routing to that.

Joren's voice coming up from four levels down, hoarse, reporting that the entry corridor is holding, that nobody has been shot, and that Old Berin has broken a wrist falling over a sample case and is being extremely dramatic about it.

Tilda refusing, twice, to fire the airlock charges, because there are still Mountmend people below her line. Then refusing a third time when it's Selka asking.

Pip's transmission from the surface, four kilometers up and forty minutes late, saying only that there are three Authority cutters inbound and that he has not moved the boats, and that Elder Moss says to tell us the village is fine.

And Draeven.

I keep trying to describe this part and it keeps coming out wrong, because in a book it would be one thing and in the room it was fifty small ones.

He isn't fighting for most of it. That's what nobody believes when I tell them. For long stretches of that afternoon he simply stands, in the approach to that raised floor, at an angle he selected in the first minute and did not alter, and men come up and see him and stop.

Twice they don't stop. Both times it's very quick and I don't watch.

The remainder he spends reading numbers aloud in a flat voice for my benefit, because at some point he grasped that hearing him count is the thing that lets me keep working. Four coming up the east. Two of those turned back. Nine minutes since the last attempt. Clara, thirty seconds, they're going to try the ceiling.

He takes a round through the shoulder around the fourth hour. I know because the counting stops for eleven seconds.

“Draeven.”