[Spook]

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All right, let's keep going:

So I put him on AK and checked.

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I would also put him on AK, if he had bet out and was raised by you, pot odds would pretty much force him to call only getting 2-1. Which would be a mistake.
But if he checks and calls a half pot sized bet with 7-18 outs with effective odds of 4-1, he is in better shape.