Man died defending two girls from street thugs

If so, call the police and do not intervene. Try to move other onlookers, especially children, to safety. Notice whether the fighters have "back up," often in the form of onlookers who are egging on the fighters. Gang fights and similar situations are unpredictable and you should not try to intervene. Look around for any large objects that you can push between the fighters, like trash cans, desks, or anything else that is big but possible for you to quickly move into place.