Villain is a lag. I decided to call down since we don't have any spades in our hand, making it more likely he has a busted flushdraw. Is this too lose? Versus a nit, should we fold? I mean, even nits can bluff, so I don't know what to do.

About the flop, I think it's better not to raise. We don't block his continuing spade hands and the board is very draw-ish. Seems much better to just call and keeping his range wide imo. Am I right in this?