MLeake, it engenders quite a false sense of security to imply anything other than life-changing legal issues, both criminal & civil, after a shooting regardless of circumstances. I'm not going to parse words, mince words or dice words -- or even fall back in words. Too many of my fellow grads are in the legal & the police game and we've gone around this problem for many years.
Advice to HangGlider: First, stay out of those situations where the Reasonable Man might expect to need a weapon if all all possible. Second, flee if at all possible. Third, give what the BG's might want -- unless it's reasonably clear that you should fear harm even after giving over. Fourth, if your gun comes out, use it center mass -- no fiddling around. Fifth, give the cops the basic facts.
Sixth, get a lawyer on retainer no matter what.