Emerging from the gloom, she squinted in the face of the flourescent lights. Claw marks gouged the outside of the solid steel of the vault door, each at least half a foot deep.
This is another way you can do it – have the monster leave marks to be seen after it’s moved on.
Marks that give a vague indication of what abilities it has, without giving the full picture.
The catwalk had been torn down at one side of the complex, and innumerable boxes of weapons and supplies had been crushed or scattered across the floor.
Gotta check whether they’re hiding in the boxes, y’know.
Besides, crushing boxes is good for venting frustration when your target hides behind a vault door.
“Candy?” she asked. “My head hurts.”
“You can have your candy, pet. Go to your room, I’ll call Pitter in and send him to you.”
And this is basically Coil saying it’s over.
Is he right? I don’t know, but the soldiers did scour the building for Crawler and come back, so he’s either well hidden (and he doesn’t seem the subtle type) or gone.