In this short scene, we learn that we're not allowed to use illegal stances in combat. In other words, we can't fight with a stance that's illegal, even if it's just for fun. We learn that the guy who's fighting with the illegal stance isn't going to give up. He's going to fight until he's beaten the guy with the legal stance. The guy who beats the guy is going to win. And he'll do it by using his dark bring, which is the strongest and most powerful weapon in the game. He tells the guy that he has something for him to fight with, and that he won't stop until he does it.