I ask this question, because I don't have the experience nor have I done research to know.
What are the elements common to being in an Active Shooter situation where someone is bent on mass killing compared to being in a robbery, home invasion, etc? Now, what elements are specific to an Active Shooter based on mass carnage that don't generally exist in other situations? That is what I would want to train defensively for....hit the relevent, meaningful points of like and dislike actions....if they do in fact exist.
I would think there are elements common to the Active Shooter that are common to other events....is the druggie who pulled a 38 on me on the beach (I'll never know how he got those 2" diameter bullets in that cylinder) when I was 15 any more or less dangerous to me than someone wanting to kill a lot of people and me being in the wrong place at the wrong time? Is there something different about the events that would be key in helping survive?
My perception is that there is something helpful here. I have been known to be wrong.
I would certainly think that one commonality would obviously be the threat itself and the desire to remove ones self from the danger of the threat. Therein lies the rub because each threat is different.
You take a case of home invasion where an armed thug breaches your home and threatens you by wielding an 870 pump. In that situation, the single point of focus of the threat is on you (and loved ones if present) directly.
You take the same thug and plop him down in the local mall where he has suddenly and violently taken exception to Ed's Taco Emporium for screwing up his order and he decides to come back and vent his frustrations, with the same 870 pump, on the center food court at the mall. If you are in the mall, technically the treat is the same as at home, but the point of focus is broader.
The threat is the same but the variables are different.
*In the home, you are kind of automatically the direct focus of the assault.
*In the mall, you may or may not be in the direct focus of the assault, largely dependent on your location to the threat, and that is what would dictate your course of action from that point forward.
*In the home, you probably would be cornered with no option but to fight.
*In the mall, you might have multiple options dependent on the actions and movements of the shooter.
The only thing that is certain, is that nothing is certain.
Like MB said, there ain't no easy answers.........
But at least maybe a lot of folks are thinkin'.