If one intends to practice drills for defensive shooting, I do not think that practicing at "a distance"--any distance--is really the best way to go about it. Think about it: if you are the victim of a surpise attack in a parking lot or parking garbage, the distance is going to be what it is....unlike target practice, in whig the distance is planned and known in advance. The shooter in this video, who is not standing at any fixed distance from any target, has no idea about the distance to his target until his instructor calls out, without any kind of "ready--get set--go", which target to shoot at. One may find it difficult to find places to practice that way. I suggest that most people could find a way, and that combining that kind of drill with some stationary shooting and perhaps some air-soft practice would be helpful.