No matter what, you should not. This sport you are reffering to has definetely not been invented so you cand start fighting with people around, for any reason. If indeed your friend is in trouble, and there are some bad people that want to hurt him, as they've done to others, you shall get some help from an adult, either from your parents or the police. This is something serious and you should not make yourself justice.
sper ca ti-am fost de ajutor ^_^