16s: Bad Fold?

[holy32]

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What does he have that I beat that also does not fold preflop and bets out on a low flop?

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Why do you think he is that tight ? Do you really think he folds AJ or KQ for that matter there ? It's 16, he's a donk. He could have KTs or just about anything else.

And even if he has AQ+, 99+ you are still about 30% to win. You are getting 4:1, or 20% to call for a huge pot. This is a must-call.