Is this considered a muck?

[rminusq]

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How many times, tho, do u see a player who is trying to show cards at the showdown and the cards go face down...

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Rarely if the players have any appreciable motor skills. Turning cards over is not difficult. Don't throw them and you won't have a problem.

In any event, that's irrelevant to what actually happened, which wasn't at showdown but while facing a bet.