Oh. Oh Inigo, you're speaking Tidus's language. And look at this smile, this grin. Tidus takes one of Inigo's hands into his, ad you can just see he's getting into loud mode.

Even before he swings up his free fist to loudly exclaim,

"ANYONE WHO TRIES ISN'T WORTH OUR TIME!

No, Tidus doesn't care who hears them in this dark carriage, whether there's anybody nearby to see either. This is about them, their moment! Their courage!!