Inigo's mouth opens and closes a few times, like he's trying to think of some sort of protest - probably something along the lines of asking Tidus why he can't just explain it right now - but not finding the words for it.

Especially since he does suppose he should get this machine over to the games carriage before anyone else puts their grubby hands on it and breaks it..

"A-Alright?!"

So he ends up with agreement.

Just.. confused agreement?

"I.. will see you later then. After I'm done with the machine."

(It might take a while.)