i could lay it down or i could call...i would not always do the same thing as i would not want to become predictable...

anyway, more often i would lay it down, as the pot is small and easy to walk away from, unless i have a read on the villian

the hand follows a classic pattern...you raise from late to steal the blinds; the small blind calls to defend--probably because he is on a draw; small blind checks to the pre-flop raiser, who missed the flop but bets to win then or at least buy a free card on the turn...small blind called, indicating on a draw...both check on the turn-raiser got his free card, blind still on a draw...flush scare card on the river, so small blind raises...

its solid poker play...

you call to confirm the pattern, or fold because you don't think you need to confirm...