If B1 is making an effort to go around the screen and A2 rolls into him/her during this effort its a foul. However what I see the most is that B1 simply stops at the screen and A2 begins to roll and make his move before B1 decides that he needs to get around. A2 got there first so its his right to the space and B1 is late and usually in a bad position to play defense.
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in OS I trust
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