twyacht. Just got a chance to check out the videos with magazine changes with a air rifle and pistol. Those guys are really fast. Very impressive in a controlled environment. Would be interesting to see how well they would do with rounds flying past their heads and buddies dropping left and right from enemy fire. 
Very True. I think for us "non-criminals", at least the "practice, practice, practice" is a huge benefit. The vids show the "physical mechanics" being done very quickly after ALOT of practice. The SWAT team that took out the parolee, practice and train relentlessly. They will learn from this encounter, and train some more.
FWIW, (I think the pistol guy needs more of a life since speedloading is something he has spent WAY too much time on.)
If the SHTF, shooting situation, adrenaline, SD, even casualties, the mind, as the master weapon, must control the body.
Hard to say. IMHO, I've never been in combat, but do practice and train ALOT. All I can do is condition my "mind" not to let my body down if and when I need it.
"I would add another reason - practice. Anyone who has ever been deeply involved in warfare knows that the only way to learn to fight is to fight. This may not be a popular view with the grass eaters, but I defy them to disprove it."
Jeff Cooper