Killer in the school

You scream and leap at Sam. In shock he tries to block you but you are too strong for him. You punch him repeatedly in the face. He eventually shoves you away and makes a grab for the knife but you just beat him to it. You hold it high ready to use it. "Please dont kill me" Sam pleads "I dident know what I was doing". You begin to wonder whether to kill him or not when he jumps at you screaming. You lift the knife just in time. Sam lands on the knife and screams in agony. He crawls along the floor leaving a trail of blood. Eventually he stops. You know he is now dead. You pull the knife from his body and go to help Jak.