At my club last night, after a routine auction, West led the ten of hearts. East won and returned a heart. Declarer cashed his red winners, West discarding a heart, and East a club. Now he tested the spades, and East transpired to have four. He cashed the ace of clubs and played a club and the queen did not appear. After some thought, he tossed a coin, and when it came down heads, he rose with the king of clubs, successfully as you can see.
East, the club's equivalent of the Secretary Bird, called the director, and argued that South was not allowed to use the result of the toss of the coin to guide his play (Law 16A3). Finessing was a logical alternative which was less successful. The atmosphere became quite charged with South calling East a pedant and East calling South a tosser. How would you rule?

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South West North East
1NT Pass 6NT All Pass