1. George ambushes Trayvon. 2. Trayvon who’s been trying to get away from this man who’s been stalking him is startled — he probably sees George as a mugger and someone who might kill him. 3. Trayvon lunges at him. He might have already seen that this stranger has a gun. Or George may very well have been brandishing his weapon already. 4. They both fall to the ground at which time George receives a bump and a small laceration in the back of his head. 5. At the same time that happened Trayvon had his hand around George’s neck which result in another small gash. 6. They both get back up. George is still not letting down. He comes towards Trayvon aggressively and Trayvon punches him in the nose. 7. George shoots Trayvon from a short distance…

Either one could have been yelling almost murmuring for help. George actually has the type of family background that would almost require him to call out for help — he knew he had his family backing on this and from his father (a former US Magistrate). He ambushed Trayvon and Trayvon stood his ground.