The CCW citizen did everything right except maybe talk to the press, although doing so put an immediate explanation for what happened in public.
Instead of this... "Today a man shot a teenager in a conflict at a gas station. The teen tried to escape but as he was doing so he lost control of the vehicle, striking a tree and ending up upside down in the middle of the street, to the horror of onlookers. The accident proved to be fatal to the teen and the man who fired the shot was immediately taken into police custody."
...we get this news story with the back story filled in. Works for me, but I hope it doesn't prove to be a mistake for the gentleman. He did present himself very well.