Was it a possibly dominated Ace or small pair?
Maybe he was wondering if King-Queen was good for a coinflip?
Perhaps he had a big pair and was working out whether to smooth call to insight more action?
Nope, he eventually called and turned over the monster that is 5-6 suited. It turns out it was actually the best hand to call against Kays Aces, maybe he knew something we didn't?
Either way, there is no chance anyone will be taking liberties with Tabatabai's blinds anymore.