If you went to school with a guy that kept threatening people and you feared that he was going to try and do a?

copycat of the Columbine macre, what would you do? Because there is a guy at my school that scares the piss out of me and last year he almost busted my head with a bag full of text books. His role model is Adolf Hitler. He also makes death threats to people and such. And everytime he reaches toward his bag, I fear that he is going to pull out a gun.I talked to my mom about it and I don't think that she sees it to be as serious as I do. I talked to the school administration about it and they won't do a damned thing. I told the librarian today and she sent an email to the principal.