Is this a bad semibluff?

[Benoit]

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If someone raises all-in, you're going to be calling t605 into a pot of t1030 already.

I can't laydown two overs and the nut flush draw there. Can you?

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At least by leading out you have a better idea of where you stand if reraised. Then yes, if my two overs are clear outs I would call with 1.7 to 1 pot odds, but the problem is if you're against a set, two pair, or top pair w/ ace/king kicker.