"Easy there, son," Sinclair says, laughing exactly as he did in the hallway. "I think I've got this part covered."

Apart from preferring to keep his pants on around his guests (you know, usually), when it comes to dumping antiseptic on a gaping wound...that's not something that's fun to leave to the suspense of waiting for someone else to do it. So for the sake of control, he would rather do it himself. The only thing that worries him at this point is whether or not this is going to need stitches. It looks a lot deeper when it's bleeding profusely, maybe once he cleans it up it won't be as bad. Right? That's how these things work?