In fights people do what they have trained to do. You have no time to think and ponder, even if a person did are they really going to think "ahhh hmmm, shoot to stop yes that is what we do in situations like this" ???
You train to put 2 in the chest and it becomes muscle memory you draw and you will probably put 2 in the chest.
Untrained people are constantly shooting people in the legs and abdominal region they have no training only "I will shoot them"
I have never been in a all out gun fight but a good number of kickboxing and mma fights when you are at it -you just do-. Muscle memory/training.