Snake when the SHTF you are going to react as you have been trained or self taught. That is my .02.
Your inner fears take over and you get tunnel vision against your attackers. Things get rythmatical and you function how you have been trained. Not always their is an Audie Murphy out their in a number of troops.
A sad story I read a bit back of Police officers who were involved in a bad guy shooting from a number of years ago. The instructor 'pin head idiot' had them picking up their expelled mags at the training range.
Guess what they did during the tense shootout?
Draw practice shoot as if your life depended on it.