As far as he can tell he's got the mooks backed into a corner, and the only think to do is give them a good ol' fashioned beat-down.

He hears Wash distantly, but people tell Casey to wait all the time, and he only listens to a fraction of them. His body is always in motion before his ears can tell him that someone wants him to slow down, and once there he's too wired with adrenaline to actually stop.

He does manage to turn around as he approaches the main room and call "Freelancer! I got 'em trapped! C'mon!" before he bolted inside.