In the middle of the battle, Caius yells at his brother to hurry up and kill the guy who's trying to kill him. He's not an ordinary guy, he says, and he's using a special kind of martial art to kill his brother. Caius's like, "Dude, I don't know how to use a special martial art, but I'm going to kill this guy anyway." The guy's got a good chance of killing Caius, and they should kill him anyway.