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Lets say I hold A [img]/images/graemlins/diamond.gif[/img]3 [img]/images/graemlins/diamond.gif[/img] and I'm HU.
Flop is 4 [img]/images/graemlins/diamond.gif[/img] K [img]/images/graemlins/diamond.gif[/img] 7 [img]/images/graemlins/spade.gif[/img]
Other guy bets out and I suspect he holds a K.
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That you suspect he has a king doesn't mean he has a king.
The nut flush draw is a very strong hand. It's almost impossible to fold the nut flush draw correctly in limit. (I rarely fold it on the flop in NL, when the bets are much larger in relation to the pot.) The question is whether to raise or fold. The right play in most limit games is to raise.
Remember that your ace-high might be the best hand. If it is, as it will be at least a few percent of the time (and more in an aggressive game against good players than against bad, passive players), you'd be making a huge error by folding.
Even if your ace-high is not currently the best hand, you have a huge draw, 12 outs to beat the current top pair. You can easily be only a 55-45 underdog against a strong hand.
If you raise, your opponent will suddenly hate a lot of hands, and may fold a hand like 55 or A6. Your oppponent will call with any flush draw, even though those are in terrible shape against you. Your opponent is less likely to bet on the turn when there is a blank.
http://twodimes.net/h/?z=1296756
A[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 0.468
Q[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] 0.532
http://twodimes.net/h/?z=1296757
A[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 0.466
5[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 0.534
http://twodimes.net/h/?z=1296758
A[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 0.654
6[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] 0.346
http://twodimes.net/h/?z=1296768
A[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 0.337
K[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img] 0.663
If you get 3-bet by a passive player, don't expect your ace to be good, but you have the odds to call to the river anyway. Against an aggressive player, cap if you are 3-bet, and expect your ace to be good much of the time.