Thank you Clay and David.
I saw this last year and liked it a lot. It made the news also. I would do this class and the the free LEO one. Know the LEO outlook, but know your options to make a difference and not just sit by. They teach the "swarm". I'm fine with some sacrifice of a few to save the lives of many. The math is in the favor of the group.
Fact is, this situation is likely to end up hand in hand, and training for that needs mats and other safety measures. I'm more than five years away from devoting that time and money into that level of training. If you have not gone heads up against someone, trained and untrained, go do that. It's a huge eye opener. I tell people to go do a pull up. Many, can not do one pull up of their body weight. This should be a big indicator of the struggles you will face if you have to fight someone. You can not move your own weight, how do you think you are going to move yours, and the person you are fighting? Most people have what is called the "universal fight plan". That is, I will hit the person one time, so hard that I will knock them out or make them quit. You are lying to yourself. Even trained fighters are unlikely to make that happen.
The dynamics of active shooter situations, in my opinion, have a lot to do with reading the situation you find yourself in and playing all things to the advantage of your survival regardless of you seeming weak, or you being in beast mode. And, it's regardless of you having a weapon or not. All training does is increase your percentage of possible success. The factor of the other persons ability is always an unknown. You can only effect your ability of being better than the majority. Train, train in everything you can. Be strong, skilled with weapons, skilled with moving your body, and have a sharp mind and be situationally aware. Even with all of that, it may just come done to calling their bluff and having confidence.