Don't have much faith in the school to settle this matter to your satisfaction . They need proof and even that doesn't guarantee you will be left alone , after they discipline the idiot . You would do better to let it go and just stay away from the nutjob that hurt you . Someday he will get his by someone bigger and meaner than him . Just be nice to people and treat them like you want to be treated ,soon your army of friends will be bigger than his .