[Insane_Steve]

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InstaCall

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Especially assuming the K isn't a spade. If he has a 5 here, oh well, but you are getting like 3:1 if the stack sizes are correct and there's a LOT of hands he's doing this with that has no 5.

EDIT: Actually Sphere's analysis of the turn play looks better. I think I'm getting it in on the turn, since A5 or X5ss are the only X5 hands that make sense here and you are getting paid off by all kinds of AX hands against a lot of opponents at 100NL.