Riss
Member
I have been to training where everyone actually drilled the 21 foot Tueller drill. Only 1 % could actually get a good shot off before getting run over by the person charging at them. Drill was off set so the charging person was neither shot nor the shooter overrun. If you have the gun holstered with a threat at 21 feet you have a poor chance of actually stopping the threat without being injured yourself. With the gun already out of the holster you have a better chance of not being hurt and a better, but not great chance, of getting off a good aimed shot.