South is declarer in a ♥ contract. East has won the previous trick and leads the ♦Q. South claims, making no statement other than something like "I have all the high trumps".
West objects, saying "I have more trump than you. I get a trick at the end". South, somewhat flummoxed by this unexpected objection, concedes a trick to the defense.
This is the last board of the round. West leaves the table. Before the next round is called, South articulates the fact that he can ruff his losing spade with the high trump in dummy, West will be forced to underruff, and declarer need lose no more tricks.
West is located and the director is duly summoned.
How do you rule?

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