Because I do not know what player B9 is, I will explain this assuming the B player was front row (B2, B3, or B4). B wins the rally because A5 is a back row player, and the effect of the play was a back row attack. If the B player was back row (B1, B5, or B6), the call is incorrect, because of a double fault. The fault is two back-row players simultaneously contacting the ball in the plain of the net (assumes that contact is above the height of the net).
Hope this clarifies your question.
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