Video Request - Syracuse vs Duke (Video)

[Tim Quan]

Here's a question I still have.

I understand about establishing legal guarding position prior to the offensive player having begun his upward motion; but the rules don't say anything about upward motion as it pertains to a defender's ability to MAINTAIN legal guarding position.

Does the defender's rights to lateral motion to maintain LGP end when the shoot or passer begins his upward motion? Or is the upward motion criteria only applicable to when establishing LGP as the rule specifies?

In a nutshell, it seems like you can't slide or jump into LGP when the offensive player is beginning to go airborne, but if you got that LGP early, you can slide or jump into an adjusted position even if the opponent has begun his upward motion. That seems to be a hangup with critics of mine who insist this cannot be true and that the defender has to be committed to his spot by the time the shooter/passer's upwards motion has begun and that he can't make anymore adjustments to his position.

This actually sounds reasonable to me, but it's not specifically in the rule book. What say you all?