What should I do if my mother's 25Y/O BF broke her car window while she was in it and the glass cut her face?

I’m 22 and he lives in the apartment next door.. I guess he got burns somehow and when she was leaving in her car he threw something at her window and the glass cut her face. He also pushed her away when she went to see if his burns are ok. Should I go **** him up.. just talk to him.. wait till he and I cool down and talk to him tomorrow or what?? I really want to go over there and **** him up big time.. Thx