Do I need to call now?

[Redd]

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If it's a lay down it's a really really tough one. I would call this most of the times depending on the timing of his push.
Also bet the flop

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I agree, I'd call vs. an unknown here. I think everyone's giving him way too much credit by expecting him to put us on exactly AK. As played, wouldn't villain be correct to push the river with A6 anyways?