NARRATOR: Nearby, at the other end of an air duct...
THUG: Somebody's still alive over there.
THUG LEADER: And they've figured out how to lob grenades back at us through the air ducts.
THUG: I could toss in a couple more, maybe finish the job?
THUG LEADER: They're probably expecting that.
THUG: Yeah, they might have closed the vent.