X needs to jump out of the way when the door bursts open; he was expecting anyone left inside to be half-dead from the smoke. It's a very good thing they can all get themselves out, because X doesn't feel like he has the strength left to carry anyone.

So that, of course, is when the not-elf falls against the wall.

"Damn," X mutters. He takes one step into the newly revealed room, nearly loses his balance, and puts his shoulder heavily against the doorframe. "Is anyone left?" he calls out. "Anyone?"

No answer. No figures in the smoke.

If someone was left, X imagines one of the survivors would have asked for help. That's one problem dealt with. He shifts his weight and closes the door, then falls to his knees next to his new friend. "Are you alright?" he asks -- coughs. "Can you stand?"