I can't see any vaild reason not to go to your partner, because it isn't that you didn't rule on the pitch in the first place....you (PU) called it a ball already. Ball calls are detrimental to our desired game outcome.
Appealing can only benefit the PU: He can a) get another strike, and b) if there is any anger about the change, it goes to the BU, not him. No downside here.
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