Man died defending two girls from street thugs

Call the police. If either fighter has a weapon of any kind, call the police and do not try to intervene. You should also call the police if you are physically unable to restrain a fighter or fear that your safety would be in jeopardy if you intervened. Unless a police officer happens to be in the vicinity, it may be too late by the time they arrive. If it is safe to do so, try to break up the fight yourself while you wait for them to arrive.