[MarkGritter]

Although, as usual in poker, when you are not closing the action you must consider a raise behind you. I think TT pointed this out. Paying two big bets is marginal at best, paying three in this pot is bad.

Suppose player A estimates himself as even money to win the hand HU after player B's raise. It makes sense for him to call down.

Now suppose you call the raise. If player A recognizes that you are likely still drawing, and your equity is probably less than 25%, it becomes worthwhile for him to raise with his 37+% estimated equity.