Excellent job, wrwom. Thanks for posting the video. Perhaps you would be kind enough to detail the steps you undertook in order to do so. That would be a great help to some of us less savvy computer users.
As for the play, it is my opinion that the defender did not obtain his spot on the floor prior to his opponent going airborne. Instead he slid in front of and under him after the dribbler picked up the ball and both of his feet left the floor.
The defender did establish LGP and is allowed to move laterally to continue to maintain that guarding position, but he can't do so
AFTER the opponent becomes airborne. At that time, he must hold the spot that he has obtained. He may, of course, turn or duck to absorb or lessen the contact.
Furthermore, IMO this play was the C's to get right or wrong as it was well within his primary. The L should not have given a preliminary signal as the play was outside of his primary and his partner had a whistle. This is what happens when the officials do not adhere to proper mechanics.