Having just begun this journey (CCW Applicant), I find all of the above very thought provoking. Under Texas law, we were taught that we "should" cease shooting when the BG "stops". In other words, "I shot, he stopped", I stopped". Having said that, when training, I shoot five rounds as quickly as I can accurately (trying to increase my accurate rate of fire). My thinking is thus evolving somewhat as "unless Round 1 "stops" him COLD, there are four more headed his way pronto".
How surprise, shock, fear, adrenalin, and heart rate might affect that, I have no clue. That's why my wife and I plan on continuing to train the rest of our lives, and as it advances, will include advanced training that moves past simple range time.
So, feel free to make suggestions on improving on our skill base - we're always learning.
Also, I didn't mean to be sexist in the above and make out BG's to be only men, I just didn't want to spend my time typing "he/she" all the way ....:haha: