[Xaston]

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Aren't there one-pair hands like AQ and KK that Nick might play this way in order to isolate artie on the turn, then turn into a bluff on the river? I'm not really qualified to comment, but it seems like a possibility.

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Checking that flop with KK/AQ is pretty dangerous, but I guess it's possible.

But if he decides after your turn call that he thinks KK is beat, I don't think he expects you to fold whatever you have. He played it in an awkward enough manner that I would think, that he would think, that anything > KK is calling this river bet.