Regarding force, I believe the penal code states that the threat of force is justified when the use of force is justified. Correct me if I'm wrong, but this means that if you can use deadly force then you can threaten deadly force. In other words, don't make false promises that you cant (legally) backup.
The only piece of info that I could think to add to this scenario is to remember backdrops (where the bullets will go). If I'm standing in front of a gas pump or the target is in front of a gas pump, you might draw and then move toward cover without a flammable object behind you or the target. Of course, this is an afterthought and isn't something that many (including me) would think about during a tense situation. This is also where breaking out of adrenaline induced "tunnel vision" becomes important.
