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2nd nuts, Quad K's can't happen if he has one. Thanks for the replies.

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Hero can't know that until post-showdown (not that it matters for the post).

On topic: He's the first to act with 3 to a flush and he doesn't even have the top set, potting it seems a little overly aggressive. If a villain re-pots it what do you do? Fold? Call and pray for the board to pair?