She... doesn't know? Or he could be misreading her gesture, or... she could be confused about why he's asking, and expressing confusion about his confusion... but more likely the first thing, and that's not okay. She did this, she has to know.

"Hold on, I'm gonna check..."

He drags over a chair and stands on top of it, then inspects the ceiling above the spot closely. There's nothing- and nothing obvious behind the ceiling panels, either.

His close inspection of the ceiling and precarious balance leaves the path to the door quite unobstructed.