The second view shows exactly where he is generating all of that power/speed and I have never seen anywhere close to that view of his break before at anywhere near that speed and thus had no idea what he was actually doing on his break shot with that back arm. That is freaking nuts, he is actually generating rotaional power by cocking his elbow in towards his body as it is dropping, all the while keeping the full drawn and then releasing all of that at the same instant as he strokes through the ball.
Pay specific attention to the elbow dropping and cocking in towards his body, and all the while the cuetip REMAINS fully drawn back and right in his bridge hand until about 0:40 when he lets all of that go through the cueball inside of a slo mo second. His elbow is actually brought back in line by his own body and it turns around it.
Chevybob mentioned a raquettball swing, he might be right, I have never played that game, it also has ALOT of similarites to this generation of insane power.
http://www.youtube.com/watch?v=k5X86nD_WS4
Pretty crazy.