Pahja expects him to snap, and isn't at all surprised when he raises his hand. It's enough to get her to at least attempt not to interrupt him. Especially when he's being helpful! Sure, she might have had to cajole him with Elidibus' help but a pair of big, round eyes and a pointed "please" have never been so effective.

"No, no, he's a 'sorcerer of eld', in his own words." She swats at Tidus' arm in a friendly manner, attempting to get his attention so that Emet, at least, will get the praise he probably thinks he deserves as his reward for going out of his way like this. Whether or not she agrees is one thing, but she's happy enough to play into it in order to give him some positive reinforcement.

Which makes him sound a lot more like a pet she's training rather than a man she adores, but. Details.