Free Showdown? Induce a bluff? I am clueless.

[TheRapist99]

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Betting now might fold a weak king, and probably gets one more bet from a gutshot draw, so that makes me lean towards betting now.

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This guy seemed pretty loose/passive and these kind of guys don't seem to fold if they have any piece of the flop (even moreso in 6 max). If he's got a gutshot though he calls for sure.

Maybe it's not in situations like this, maybe I'm seeing monsters bc I've been running bad on and off but I feel like I get my ass kicked consistently when I value bet 3rd pair.