I may be wrong, but I think you should have made A1 inbound the ball, and make Coach B wait until they have possession.
As I'm sure you know #270 p. 43 of NFHS Says If a player or coach requests a time out while the ball is live, ignore it if the ball is in control of an opponent. It would seem to me that this would be a correctable mistake made by your partner. You didn't say anything about coach A, but I am surprised he/she wasn't screaming about the time out being granted to coach B.
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Jim Ref
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