Not as smart as some on the forum.....but wanted to give you some feedback.
A couple of thoughts.....He never gets his weight over his back leg when he goes into leg lift.
Also.....if you stop the video when his front foot hits the ground....his arm is already laid back and going into ball release. His upper body is out of sequence with his lower body. I would have him bring his hands up when he lifts his leg and separate his hands at the waist. Palms down as he pushes his hands down.