Not sure what the textbook answer is, but. . .
I have always beleived that you should get the call right. You saw the same contact your partner saw (with respect to A1 running into B1). You both agree about what contact you saw and when it occurred. You saw contact by B2 that your partner did not see AND you saw the play in such a way that you believe the contact by B2 contributed to A1 hitting B1. You share this info with your partner and he accepts what you saw - it seems like the right result was reached.
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