Well, as long as both players agree, you can use whatever roll you want to counter bluff. A: I didn't steal the pie!(Spot)B: *points at a spot on A's clothes* What's that then?(Wis)B: *sarcastic* Suuuure... What about all the other 154-times then?(Int)B: Yes, you did! You stole my blueberry pie!A: No, I didn't! Besides, it was a blackberry one!*long silence*A: Erh...(Persuade)B: *cries* That was my last one...A: *looks ashamed* Um... *murmurs* Sorry...(Str/Intimidate)B: *holds his throat tightly* GIVE IT BACK TO ME!(Pick Pocket)B: Oh... my mistake... *takes A's purse* Nevermind...