[ Inigo glances over at Tidus. Surprised, at first, but then he sees that fist and Inigo instead just lets out a short laugh. He pushes with his hand against the fist, as if to push it out of the way, but it's a weak sort of action. A joking sort of action. ]

Of course your advice would be "go ahead and pick a fight with your father!" [ Nothing could possibly be more Tidus-y than that.

Especially since Inigo knows it's the sort of mood Tidus gets in around old men. He's seen Tidus do it with Roland so often.. Like it's instinct. Even though he gets that the other is joking here--

But that's exactly why Inigo just laughs right along. ]

You want me to get into a fight with the ruler of Ylisse himself?