The red seam under the hatch pulses faster, and the floor answers with a deep, grinding shudder. Dallas holds the notes beneath the stairs, the sigils lit like a bad idea catching fire.

Clara goes white as the hatch kicks once, hard enough to rattle dust from the beams. Murderbone plants his paws and growls at the concrete like he can bite the sound itself.

The paper in Dallas's hand matches the seam's pulse. The little symbols are a timing key, not a lockout. Somebody wanted him to read them and finish the sequence for them.

Below the hatch, the scraping rises into a wet, brutal pounding, like something trapped is learning the shape of the door. The red light narrows to a knife-thin line, then flares again, waiting.

Dallas traces the symbols line by line, not as writing, but as a schedule. The pauses, the repeats, the clipped marks, they map the hatch’s pulse to the generator’s rhythm.

Clara stares at the paper, then at the hatch, as if she can still force the mistake back into the page. Murderbone shifts his weight, keeping his body between Dallas and the trembling floor.

Dallas folds the notes along the hidden sequence, revealing the trigger mark they were meant to hide. It is not a seal at all, it is an instruction for when to let something listen.

The hatch bucks once, then goes still for a fraction too long, as if waiting to hear whether the command has been answered.

He throws a low warning growl at the seam and braces harder against the floor.

Dallas snaps the sequence out of phase, ruining the hidden timing. The red pulse stutters, then loses its clean rhythm.