It is 4 AM Saturday when you hear your roommates shouting. You get up to see them arguing. Your 19-year-old roommate is threatening to kill everyone. One of your roommates already called the police. The angry 19-year-old male roommate attacks a male roommate. Everyone shouts for him to stop. You get your gun. When you come back, you see the 19-year-old strangling the other man. You shoot the attacker. The 19-year-old stops strangling his victim and the male victim collapses. The 19-year-old attacks one of your female roommates. He is strangling her when you shoot the 19-year-old attacker for the second time. Now the attacker lets her go and he collapses. You call 911.