What would you do if you saw a man hit a woman?

My husband & I were out one night and he saw a girl getting her a$s beat by a guy. Well he tried to jump in and got his a$s beat with a baseball bat. Someone else I know tried to jump in and break up a fight and the 2 guys shot him and he died. Getting into someones business can be dangerous. If anything anonymously call the police and leave a tip. Taking matters into your own hands can be dangerous.