Movement in defensive situations can be critical. No one should stand still in the open or behind compromised concealment. Too often in training shooters run faster than they can assess surroundings and targets. When you need to run – run, but when you need to move tactically don’t let your feet outrun your eyes and brain. If you shake your head from side to side very quickly, you will notice it is hard to recognize what you see and just as hard to stop the motion when you do recognize something. To some degree that is what shooters do with the enter-fast-and- wave-the-gun-around-like-air-freshner nonsense. When you are THERE and can’t recognize and react, you’re in trouble. Know what you can do and limit yourself to doing that.