Interesting AK hand, turn decision?

[Colombo]

I think andaquarter flopped the flush here. By check/calling the flop I think he has some type of draw or a monster. When the turn comes, he leads for an awfully small bet. The turn brought a 1-card straight draw, and if he hit it, this is an extremely weird bet. You'd think he'd want to protect his hand against the flush draw. I really see this bet as a flopped flush (probably nut) trying to squeeze value from the straight or another decent hand.

Either way, I don't think you are good here, and the king high flush draw isnt THAT strong. Also, the other player in the hand certainly does not help your cause.