Other than it looking cool, what is the practical application for this? I don't have my mags lying around, in the standing up position, on a hard surface, ready for me to load in my firearms one handed. From the competition standpoint, how many seconds did he save my doing this rather than using two hands? 1, maybe 2 seconds?
You're right, it's hard to imagine a practical application, but USPSA stage procedures require creativity to be competitive, and this guy certainly was creative, making the most of his strength, agility, and (I hope) a weak recoil spring. I shoot a G34 with a 13-pound spring and I can just barely get the slide to
begin to move back, using all of my (limited) power, when I try to mimic what this shooter was able to do.
In this game, at the level that this guy must be playing, fractions of a second do count. I scanned the times of the first and second place finishers in all six stages in a recent match, and the difference was about a half second on most of them. Speed is really important in USPSA!
At my level, I just try to be safe, to engage all the targets, to score points on the targets, and to move quickly enough not be embarrassed. In a recent match, I scored the highest number of points (hits on the targets, not counting the time) on two of six stages, and I still ended up 24th out of 31 shooters overall, because I'm not fast enough. Needless to say, I've got a long way to go, but the challenge is fun.
Chris