When a person sees a lethal threat and decides to present the pistol and fire do they change their focus from the reason (gun, knife) and look at where they want the bullet to go (i.e. high chest)? Or do they plan on looking at both at the same time?
I'm not looking for a discussion of which is better or even possible, just a person's plan.
If a person believes in the wide spread idea of tunnel vision and they believe that they can't see both and have or plan to switch focus to their target, then what aspect of what they believe/know they can see must change for them to stop shooting or pause shooting to evaluate?
I ask this question because the answer a person gives, should go a long way in answering many other questions. However, this question is usually assumed and almost never gets discussed. Then we get strange ideas about how we should make our pistol operate in a gunfight that in reality won't work as well.