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but youre beat by 5dxd and up.. do you really want to bet your stack on the worst possible flush? (barring that 5d doesnt hit on the river)

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The whole point is that we do not think villain has a flush. Hero's flush is well disguised, so it is quite possible villain is making a play at the pot. You very rarely see a made flush play this way at these stakes. I would not be the least bit surprised to see villain have a set here with one diamond or some other hand that Hero has beat.