I'm pretty much of the mindset that if you've found yourself facing an unavoidable threat and you've decided to defend yourself, you better commit to it. All this talk about reassessment to help protect yourself legally just seems like more stuff you realistically won't have time to think about in a fight for your life. You're already pointing your gun at another person and pulling the trigger; pausing after two shots to COM could be a pause that ends up getting you killed or shot.
A lot of folks are always saying things like "Oh, you're just an internet commando, I bet you'd be peeing yourself in a gunfight!" -- Yeah, I'd probably be peeing myself, but I'd be doing it while firing off as many rounds as it took to stop my attacker from killing me. I've stared down the barrel of a gun before, and let me tell you that if it ever happens again and I am armed, I am going to be doing something about it.
Just my two pennies :)