I don't see how lowering the ball as you begin your spin backs the defender off, but I'll take your word for it and look for it next time I see some live action. It may make more sense when I see it done against someone instead of just open space in a shoot around.
edit: Ok, just watch some Garnett highlights. He does do that, but when he does he's either fading away or spinning past somebody so that he has a clear path to the basket. I was thinking Portis was using that move to go straight up over someone without a fade or without spinning past them so that he would have a defender right in his grill as he's trying to bring the ball up. In the Portis video, he wasn't fading, and he wasn't going that hard or fast as if he were spinning around someone toward the basket, but I'm sure in live action he goes much harder and it works for him. Like I said, I'm no expert. Thanks for pointing me in the right direction.
This post was edited on 1/20 at 6:01 am