I actually don’t mind that form of squat and have done it myself. I’ve only experimented with it on a couple athletes who were a little more advanced in weight lifting movements and we didn’t have any problems. The shoulder press isn’t really a shoulder press….it’s more of a hand guide following a squat with an explosive finish. Anyone that’s Olympic weightlifted (the sport not just for training) is familiar with ‘re-racking’ heavier loads on to the shoulders following a press or jerk. I’ve found this to be MUCH easier than doing that and in fact many athletes, if told to move a moderately fast squat load as fast as possible will display a similar ‘bar jump’ at the top of the movement. Ideally, to do these regularly or with athletes who weren’t as skilled with re-racking you should use jerk boxes. I’ve seen it done where the athlete actually propels the bar over there head and the bar lands up high on a jerk box in front of their face…ready for the athlete to then step under in back squat position and do another rep.