10+1 MTT: Does Villain have to beat King high straight here?

[TPTK77]

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do don't bet 400 on turn, that is a complete nothing bet, either 700 to make him think or preferably check behind.

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Yeah that's what i'm figuring. I should've bet much bigger on the turn. I'm thinking a missed flush b/c he's showed weakness up to the river. Sets, 2-pair, and most better hands, play much more aggressively on flop.