This is quite simple, but I'm just wondering if someone has a vague idea of the frequency someone would try to bluff this river with just ace of spade blocker... Like maybe hes turning a hand like A8 with the ace of spade into a bluff here, or maybe he floated flop with AQ with the ace of spades., hands like that. My assumption is that people would rarely bluff this spot since I could have been barreling with a flush draw and a random villain trying to make me fold a flush here is very ambitious. I would appreciate some feedback!