A few posts there pointing out things I didn't know.
To me it was murder.
The guy had already called the police and all the pair needed to do was to go inside.
Its just another prime example of why people should not have guns. In the UK, they would either have had a fist fight and called it a day or more likely nothing would have happened. As it was, the guy tried to wrestle the gun from him and he was kind of within his rights to defend himself.
If he hadn't brought the gun into it in the first place it wouldn't have happened but American law doesn't really consider that as far as I know. When you say its OK for your average borderline retarded human to own a gun you are acknowledging that they are allowed to use it in some capacity.
Despite what we in the UK would think I can't see where what he did was likely to get him in trouble.