If it's a real "self defense" situation how far away could the two people possibly be from each other? If I'm not confident enough in my shooting, or in my weapon at ranges around 15' or less... My death would fall under "thinning the herd" of stupid people. +1 for the bad guy.
Job well done on his part. 
Did you ever consider the fact that some people have disabilities that might just have an effect on their shooting capabilities?
And that when the sh%t hits the fan you may not be shooting from your normal, well practiced stance. It may be in the dark, from inside a vehicle, running (away), or any number of other situations that I or you can't predict. And most of the thugs out here are wearing hoods so that in itself makes for a "let's see, where is his head in there?"
Beyond extremely close range (0-3 feet is "point-blank range" and 3-9 feet is "close range"), handguns are very difficult to shoot accurately.
According to Sanford Strong, retired San Diego police SWAT team instructor and author of “Strong on Defense,” police officers miss with 75 percent of close-range shots while criminals miss with 96 percent of close-range shots. And a moving target is even more difficult to hit.Just my thoughts and I welcome yours.