I have a friend at karate who I also go to school with. The problem is, he's a black belt in Shotokan as well as a yellow in Trodai Karate, he think's he's above just about everyone, he also uses his karate outside the dojo in an offensive way. I myself use it myself but only on other people who attend the club when just practicing. But on occasions I have witnessed him doing stupid things like knife hands to the back of people's neck. Should I say something or just let him work his way into trouble. I don't want to seem like an * for saying something. What shall I do?