Please note that it is A2 who touched the ball, not B1. It would be perfectly legal for B1 to smack the ball.
Here's a synopsis of the case book play:
During an attempted throw-in, A1holds the ball through the plane and hands it to A2. Ruling: Violation
I know that in the offered situation, A2 touched the ball instead of being handed the ball. However, I think the same ruling applies.
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