[bobhalford]

I like the river fold. You have been representing a K the whole time (and potentially a FH once the board pairs on the turn). Even if SB is aggressive, he would check if he had Ax, because the Ace completes a flush draw and may not even give him the best hand. He could even get raised. Which is maybe what he wants (barring when you have AA/KK). To me, it doesn't look like a bet at a scare card, it looks like a strong hand that doesn't want to have the river checked through.

In this hand I raise the flop. Raising the turn is ok, but I prefer doing it on the cheap street to define my hand a bit better. Then on the turn if sb checks, I bet. When the A hits on the river you can check behind or call a river bet if you think he's trying to scare you out of the pot.