[Kaeser]

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You flop top set. You bet, opponent calls. You turn the boat and have the imortal nuts.

Not to be a nit, but when you turn a boat after flopping top set you do not have the nuts.

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I was thinking the same thing at first however example: A-10 board reads A,A,5,10. Although generally a set refers to a pair in the hole I do believe it can also refer to a single card that makes 3 of a kind on the board.

To the OP: I can't say whether this guy is trying to angel-shoot you but I've seen cases where a player slid a chip off of his cards and another player tried to make that a call as he now had a chip forward of his hand.

Best defense as far as I can tell is to wait for a verbal announcement of his action or ask, "did you call".