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Is this normal or a huge leak?

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If you have a read that says your opponent frequently shows down crap, you see a betting pattern that says it's happening now, AND you have SOMETHING with a good chance to improve to the best hand after the flop, by all means hang in.

If you have no reads and only Ace-blank offsuit, huge leak.

And the leak is magnified at full ring, where there's a good chance that whoever you're up against is the guy who has a PP or flopped a card or two. Don't pay off because of what you think your opponent's doing. Pay off because the facts you have say you have a good chance to win.

Tossing AQ vs. a LAG in a tiny HU pot is not a sin - even after the turn or river - he'll pay you off plenty to make up for it when you DO have something.