When you call the turn I don't think so as a big part of your calling range is a strong spade with a pair, assorted
or
combos... If you had two pair/ a set you'd likely raise the turn... So he's hoping you're either floating with nothing button on blind, or that you'll fold
downwards type hands, which you won't as it's button on blind. It's a play based solely on abusing the button on blind dynamic which looks so predictable from the way he's played it. I think I'd call with most spades in this spot