I do find it funny how he could totally take what he wants if he revealed his cutlivation, but he's basically flirting with her by playing these games. The whole push/pull game of intriguing a woman.
Ha ha ha! This sucker's bet! Still, since there's no way he'd lose, I guess Su Yang want's to test potential disiples for some reason and its not like it would be any loss to the Sect if he did..