MOVE!

Think about these two scenarios:

1. You are suddenly faced with an immediate, violent threat. In whatever time it takes you to perceive this issue, you begin to react as you have trained. With your feet planted in a perfect shooting stance, you begin to smoothly draw your handgun and go to work. On the range, you have trained doing this to the point of perfection. 

Of course, whatever that immediate threat is may have been working on hurting you looooong before this and you are way behind. Unfortunately, your first reaction is to continue to stand there.

2. You are suddenly faced with an immediate, violent threat. In whatever time it takes you to perceive this issue, you begin to react as you have trained. With all the speed you can muster, you begin to MOVE. As you move in whatever direction you can, either to some form of cover or just simply out of the way of the force headed in your direction, you start to smoothly draw your handgun and go to work.

Of course, whatever that immediate threat is may have been working on hurting you looooong before this. But, now that threat has to work on something else. Now, that threat has to perceive this issue and react to a moving target. The simple act of moving may have created the time, distance and opportunity for you to change the outcome. 

I understand this is very simplified analysis of a very complex dynamic. But the truth is you will respond to fight or flight stress with the most embedded reaction. If the core of your training involves standing there, well, there you are. 

Move it!