The higher the speed and the lower the drag the instructor claims, the more likely you are to see this sort of behavior. The implication is that the instructor is so skilled that they can always miss you, and that if you take their class you will become just as skilled.
It's much the same as the instructors/schools that claim to operate under "big boy rules" for people that wear "big boy pants" - involving some shooters advancing ahead of the rest of the shooters because that will happen "in real life".
Most of us are never going to be part of a stack charging up the stairs to take out Osama bin Laden, or busting through the plate glass window to take down a gang of bank robbers holding grannies and Girl Scouts hostage. So we do not go looking for trainers and training that expose us to such high levels of risk. Maybe Seal Team Six and Food Court Team Eight will face those situations and need to train like that. But they signed up knowing that they were going to go into extremely dangerous situations where they could be shot by either the "enemy" or their team buddy. Us "normal" folks generally do not look for that much excitement.
Maybe the best we can do is expose those HS/LD folks - here's their sign