Xehanort's sudden grin is full of teeth and things that suggest it's anything but a happy gesture. "You'll never guess what else I don't know!" It fades almost as quickly as it appears, back to sobriety. "I just know it happens, they won't give me details."

And for a good reason, because timey wimey ball. "...Rewind a minute though."

What Tidus felt was important and what Xehanort did are apparently different things. "You lost your memories too, I take it?" There's a brief small gesture. "With this 'Sin' of yours, and washing up in strange places? Since you're here I can't imagine it's resolved.."