Inigo ducks his head, but it's just since he can feel his grin widening involuntarily. Like Tidus's words just spread that much of a warmth throughout his chest, rendering him unable to hold back the laughter that starts to spill across his lips. Happy. Genuine. The kind of laughter that comes straight from your heart, that you can't help.

"You know, maybe we should save this kind of determination for a mission, rather than a dumb haunted house."

Not that it's a protest - Inigo's tone doesn't sound like it. It's maybe instead more an encouragement, or even just a hope. Please, please never let them lose this conviction, no matter what happens. No matter what hardships will still be thrown their way from now on.