Here's where I think Zimmerman failed. He did not exercise care to avoid confrontation. Let me bring up a personal experience that will illustrate my point. I turned right on red in front of a person that was turning left from the opposite lane. Too close I guess according to him who took great umbrage at my driving to the point of pulling up next to me, taking out a 9mm out of his glove compartment and showed it to me in a threatening manner. It just so happened that I was going to the shooting range that morning and had an assortment of guns in the car. If I wanted to escalate the situation I could have shot him, since my life appeared threatened, no questions asked. The police would have found his gun in the car and I don't think I would have been prosecuted. However, I did the prudent thing and I just let him pass me and speed away. I did bring one of the guns, my trusty 1911 Colt closer to me, took the safety off and was ready if he wanted to escalate. The danger passed and nothing happened. Had I foolishly responded to the provocation he would have been dead along with other innocent bystanders since he probably would have lost control of his vehicle. This is what I call exercising care.