Straight flush mucked at 200nl Foxwoods?

[SellingtheDrama]

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The dealer did not even make an attempt to make a ruling, she immediately called for the floor, who eventually called over a higher level of floor management.

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Smart dealer - didn't know and got help.

And my ruling would be villain never expressly folded, and still had the option to call. Bigmouth is a freaking idiot.
If the cards weren't quite where I think they are, I could change my mind.