Thanks CO, I think the specific things that puzzled me was the demonstrations of what happens when you thrust a pistol forward like that, the barrel and point of aim dip down. Reason why they prefer you raise the barrel upward and shoot as soon as the gun comes up to the target with no hesitation. Or very very little. And he uses two hands even at super close distances. I guess I'm in your boat. Maybe I'm no expert, which might be a good thing, because that doesn't look like the right way to train your body since in a panic you will "really" be pushing that gun down and wont have a free hand to open doors, hold a flashlight, push or use for balance. I'm finding that using that left hand for balance in my crouch and one arm, I'm much more accurate and honestly already dramatically quicker delivery than this student is showing with this triangle two hand, jabbing, technique.
From my simple understanding the Applegate one arm method is the same as that square stance triangle he is using but only with the left hand removed. And I thought the most effective way was only bringing the left hand up and into the firing hand after you find yourself back at a certain distance 15-20 feet. Then at about 30 feet maybe begin to gain your composure more and transition to weaver sighted type of shooting.
At the distance this student has two hands completely extended and only 2-3 feet from the target, it seems they are very vulnerable to the attacker reaching the gun, or even dropping down lower and shooting from the hip and literally clobbering this guy.
I'm no rocket science but it seems like there is a lot of instruction on the web that is less effective than it could be. Or at least these seem to break a lot of fundamentals Applegate really stresses, even up to the 1998 presentation I may have referenced, which lays this stuff out masterfully.
Hey this is the time to think and analyze and I know this is nit picking a little, but the devil IS in the details.