A shotgun is a devastating fight stopper. And that is especially true when the shooter takes the time to get good training and to learn their individual shotgun.
One of the reasons that it is so important to have a personal-defense plan is that in a violent encounter we may have to deal with several emotional levels.
Instead of imagining events that make us the winner and hero, the defensive shooter is far better off to imagine scenarios when everything has gone wrong.
In defensive shooting, as in most other things in life, we improve what we measure. First you must make the decision to learn and then improve upon it.