"Show one, show all" in the middle of the hand.

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Different case. LHE on the flop, 3 handed pot, full table. Bet, raise. Raiser now shows his hand to his buddy who is in the hand and yet to act. Buddy folds. Bettor says WTF. Floor rules raiser/hand shower must turn his hand face up.

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Standard application of the rule. Nothing at all remarkable there. Still very unfair to the bettor since he didn't get to see the cards before he acted and now his opponent does have that info. So the floor needs to warn those two that they will be separated or sent home if they do such a thing again.