[She keeps looking at him, to the point where you can almost see her thoughts written across her forehead — that clearly educating this guy is going to be a public service, because wow has he ever missed the point.]

You realize there's no cover in this hallway, right? No alcoves, no vents, no exposed pillars. It's a long wide box with a door there, and a door there.

[She points to either end.]

You get guys like you in here looking at the tapestries, and all you have to do is close off there and there, and you're dead. You're trapped. You think you could make it to one of those doors before somebody could step in front of it with an axe? So what if the other place is a fire hazard; this one's the death trap.