[just another ref]

Originally Posted by billyu2

I agree with that situation. However, most often when I see this play A1 pivots out of his screen soon enough to block the defender's path (the defender is momentarily caught behind A1) as A1 continues his roll toward the basket. The defender, either surprised or not wanting to cause contact into the back of A1 stops or adjusts his path and there is no obvious contact so play on, correct?

Correct. A little information is a dangerous thing, and this is an example. Many coaches yell "Moving screen! He can't do that!" But there was no contact, so there is no infraction.