The idea of lateral motion got introduced because of its link to LGP: it's possible to maintain LGP against a dribbler by moving laterally.
That's not the case with an airborne shooter, which explains why everyone is agreeing that moving laterally into an airborne shooter is a block.
I suppose the point of dispute is: does the defender lose LGP by ANY motion, lateral or away from the airborne shooter? If I understand Scrapper, he's saying that by backing up the defender loses LGP and is thus liable to be called for a blocking foul when the AS lands on him.
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Cheers,
mb
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