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TwoDot's explanation is right. If A2 is the only opponent of B1 who makes contact, the foul is on A2. However, the original question is: What do you have? I will confess that I will look very, very carefully at A3 so that *any* contact with B1 will be the contact I will call a foul. Nobody in the gym will be disappointed with a foul call on A3 since it was A3's conduct which violated the spirit of the rules.
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