B1 can perform the exact same action as A1 while playing defense. B1 can leave the floor in-bounds and, while airborne, try to intercept/knock down the pass from A1 to A2 while it's in the air. Iow, A1 isn't gaining any kind of advantage at all because B1 can do the exact same thing that A1 is doing.
Perfectly legal play by players of both teams.
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