Same as any other play
If B1 keeps A2 behind him the play is legal (same as a rebounding boxout). If A2 has made his way around B1 (head and shoulders) and now B1 initiates contact preventing A2 from reaching the ball or let's say now B1 initiates contact that pushes A2 out-of-bounds... now we have decisions to make.
You now have the makings of a foul call. I would probably take into account whether A2 could have gotten the ball. If yes, then probably would have called the foul.
If A2 could have gotten the ball, then likey B1 from his better position could have gotten it first, so unless there is some ugly contact I'm probably gonna do the no foul and give the ball to B1 OOB.
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"There are no superstar calls. We don't root for certain teams. We don't cheat. But sometimes we just miss calls." - Joe Crawford
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