It isn't the engine room, not just the engine room.

There were ripples, little echos of disturbance (and wasn't that just like him to not leave well enough alone) when she got home. All of them piling on top of foreign words and a flamingo bite until she was running through the dull ache of it up the steps behind the infirmary.

Bare feet make a very distinct plat plat plat sound against metal, she finds, but the realization is gone again when she sees them.

"You don't belong here."

Paranoia bubbles over so easily around him, and it's the Master she's looking at.