You have to judge B1's contact, both in timing and severity. If everyone else is standing still, and B1 takes a free shot, I'm going to penalize him for a Personal Foul. If lots of kids moved on A1's jerk, then I may give a little more grace. You can usually tell in these cases when a player is just trying to tee off on an opponent, and I'd err on the side of safety and flagging the defender.
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