The player is trying to appear dangerous by showing interest in the flop.
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Players have a habit of continuing to stare at a flop they don't like. In their mind, by pretending to be interested, they're discouraging opponents from betting. It may even work Ñ except against you. Being educated in the science of tells, you realize that players who like flops are likely to look away. If you notice that sometimes a player turns her head quickly away from the flop and sometimes she doesn't, you can figure she's weak whenever she continues to stare.
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Here's a good bluffing opportunity for you. Also, if this player bets, you should call more liberally than usual, because there's a large chance that she's weak or bluffing.
