Nobody moved.
The voice on the other side of the door waited exactly long enough for fear to start making plans.
Then, quieter:
"Three seconds."
Mina's knife stayed jammed in the lock seam. Her eyes cut to Isaac.
Not asking whether he recognized the voice.
Asking whether the thing in his chest was lying.
Ren had gone very still again, case in one hand, other hand low near her hip where another weapon probably lived.
Jadah whispered, "No."
From the wall crack came one wet little scrape.
From the dead speaker, a burst of static coughed and died.
The thread under Isaac's sternum pulled so hard toward the door it almost hurt.
Not safe.
Never safe.
But true.
"The door," he said.
Mina didn't move. "You sure."
"No."
Honest.
He swallowed once and forced the rest out.
"But it's him."
Jadah looked at him like that was not remotely comforting.
"It's him is not a good sentence."
Outside the door, the voice said, "Two."
The wall crack widened half an inch with a brittle pop.
A knuckle came through this time.
Then another.
Something on the other side of the wall breathed in a happy little shudder.
Mina ripped the knife free of the lock and stepped back from the door.
That was answer enough.
Ren moved first, because of course she did. She shoved the case into Isaac's hands so abruptly he almost cursed and went to the latch.
"Open and move," she said.
"To where," Jadah snapped.
"Out of this room."
Fair.
The voice outside said, "One."
Ren threw the lock.
The door opened inward.
The man from the landing stood there in the harsh hospital hall light with one hand already on the frame like he'd known exactly how long they'd take to obey him.
Dark coat.
Dark hair.
Ordinary face.
No visible weapon.
Blood on one cuff that wasn't his.
No strain in him anywhere.
Three bodies lay behind him in the corridor.
Two security.
One in scrubs.
All dead in fast ugly ways that didn't advertise their method.
The man looked past Ren first.
To Isaac.
Then at the widening crack in the wall.
His expression changed by less than a degree.
"Still noisy," he said.
Jadah made a sound low in her throat that might have been a laugh if terror had better timing.
Mina's gun came up anyway.
He didn't even glance at it.
"Doctor," he said, not politely, just accurately. "If you fire, the rebound comes off him first."
He meant Isaac.
That froze her just enough.
The wall behind them bulged inward again.
This time a shoulder shoved halfway through, dragging torn sheetrock and insulation with it. Human shoulder. Hospital gown. Skin scraped bloody along the collarbone. The thing behind the wall was trying to force itself through the opening like birth had happened wrong and late.
The man at the door looked at it once.
Then held out one hand toward the room, fingers loose, almost casual.
"Come here," he said.
Nobody moved.
His eyes stayed on Isaac.
"I wasn't asking all of you."
The thread under Isaac's sternum yanked so hard he almost stepped without deciding to.
Mina saw it.
Ren saw it.
Jadah saw it and grabbed the back of his shirt with both blanket-wrapped hands before his body could betray him completely.
"No," she said.
The man's gaze dropped to her hands on Isaac.
Not offended.
Interested.
Something behind the wall made it through.
A woman in a shredded patient gown crawled over the broken cabinet pieces and hit the floor on all fours, head jerking once, twice, eyes too wet and bright. Not the young speaker-voice. Not the one downstairs. Another thing wearing a person like it still fit.
It saw the open door.
Saw the man in it.
And stopped.
For the first time since it entered the room, anything had made one of these things hesitate.
The man at the door tilted his head.
The thing whimpered.
Then it backed away from him.
Not from the gun.
Not from Mina.
From him.
Ren saw it too and made the decision.
"Move."
This time everybody listened.
Mina went first into the hall, gun up and body angled toward the room. Ren came next, dragging Isaac by the case handle because his hands still had it and apparently that was enough for her. Jadah came with him because she refused to let go of his shirt even when it made the shoulder pull white across her face.
The man stepped aside to let them pass.
Ordinary.
Human.
Close enough to touch.
Isaac felt the pressure of him the way you felt high voltage through a wall. Not heat. Not cold. Just the body recognizing a problem bigger than language and trying not to show it.
As Jadah passed, her blanket-wrapped hand brushed the metal push plate on the door by accident.
The whole plate rang.
Every exposed screw in the corridor answered with a bright little chatter.
Her face flashed with panic.
The man from the landing looked at her.
Then at the rattling screws.
Then said, like he was confirming an inventory line, "Good. You're earlier than he is."
Jadah stared at him. "What does that mean."
He didn't answer.
Because behind them, inside MRI prep, the thing in the patient gown finally found either courage or bad instructions and lunged through the ruined wall.
The man at the door turned half around.
Not fast.
Not dramatic.
Just enough.
The thing hit the doorway and stopped dead in open air like it had run into a glass wall nobody else could see. Its body jerked once, limbs flailing, mouth opening too wide around a sound it never got to finish.
The man closed his hand.
The thing folded sideways around a point in the center of itself that no one was touching.
Not exploded.
Worse.
Collapsed inward in sections. Ribcage first. Then spine. Then head. Wet cracks running through the corridor like firecrackers drowned in blood.
Jadah made a broken sound and turned her face into Isaac's shoulder.
Mina did not lower the gun.
Ren didn't either.
The man let the corpse drop in a heap of gown, blood, and wrong angles.
Then he looked down the hall.
Everyone else followed his gaze.
At the far end of pediatric imaging, where the corridor bent left toward the elevators they weren't using, the fluorescent lights dimmed one by one.
Not popping out.
Not failing.
Dimming in sequence.
Like something was walking toward them and the building was bowing ahead of it.
The young voice came back, not from speakers now. From the dark itself around the bend.
"Oh, come on."
It sounded offended.
"That one's yours?"
The man in the corridor didn't answer.
The lights dimmed another step closer.
The ordinary-looking stranger finally spoke, but not to them.
"To leave," he said, "you should've stayed downstairs."
The young voice laughed.
"Downstairs is crowded."
Mina's jaw flexed. "Names."
Neither answered her.
Of course not.
Ren shifted the case higher under her arm and said, "Route."
The man from the landing answered this time.
"Stairs. South imaging. Roof if it's still there."
Mina snapped, "You know the building now."
He looked at her.
"I know structures under stress."
That was not comforting.
The dimming lights stopped at the bend in the corridor.
Something stood there just out of true view. Not hidden. More like the eye refused to agree on the edges.
Young male voice.
Pleasant.
Mean.
Patient in a different way.
"I liked the loud one better," it said.
Everything in Isaac went white-hot for a second.
The man beside the door turned his head just enough to look at him.
Not pity.
Not concern.
Recognition of leverage being applied in real time.
"Don't," Mina said sharply.
Isaac hadn't realized he'd moved until Jadah's hands tightened on his shirt and yanked him back into himself.
The thing around the bend laughed softly.
"There you are."
Then the lights behind it blew all at once.
Dark swallowed the end of the hall.
Not total. The emergency strips near the floor still glowed dim red, painting the corridor from the knees down like a slaughterhouse under blackout.
In that red wash, footsteps started coming from the bend.
Not one set.
Two.
The thing downstairs wasn't patient.
And he didn't like sharing.
Now they were both here.
Mina backed up one step, gun steady, eyes tracking the dark.
"South stairs," she said.
No one argued.
They moved.
Fast now.
No more pretending speed could be negotiated politely.
Mina in front this time because she knew the hall.
Ren behind Isaac and Jadah, case in one arm, gun in the other.
The man from the landing not with them exactly, not part of the group, just there in the corridor at the rear like an ending that had decided to walk.
As they ran, he stayed where he was.
Not following.
Holding.
The red emergency light painted him to the shins.
Behind him, the dark at the bend shifted with the shape of coming things.
He looked at Isaac once across the widening distance.
Then said, very clearly, "Run hard enough to deserve the warning."
And turned toward the dark just as something in it smiled back.