He's surprised enough that his arms nearly give out again, wasting all his hard effort. Luckily, some part of his brain is just alert enough to follow through - to pull Crowley's legs the rest of the way under him and topple him back into a seating position.

"Shit," he says, looking (a little) alarmed, and (very) apologetic. "Sorry."

Only, Crowley's throat is really very cracked, so it comes out sounding rather more like, "Sh  . S   y."