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He also knows that I rarely fastplay, and definitely hasn't ruled out a K due to my raise.

At this point, he probably thinks I have A8, a PP higher than 8, or a K, if that helps.

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If the worst hand he'll put you on is A8, then wouldn't he definitely have a better hand than A8 aka a better hand than you? Otherwise he thinks he can push you off, which would be crazy imo.