Inigo's mind is still definitely stuck on the idea of a water cannon and what it might be like. It's nothing he's ever seen, after all. He imagines it's just a blast of water, but it's a little less regulated in his mind than it most likely is in Tidus's own - with Inigo's mind taking the idea and carrying it away to turn it into something wilder, almost like a tsunami.

.. still. Tidus seems confident about it, and Roland doesn't seem like he dislikes it, so maybe it's alright after all? At least to try?

"Well, it would sure beat having to move all of that ourselves.." That is a giant plus, for one. Inigo has already spent way too much time trying to manually get rid of all of this stuff, thanks. "And if Tidus is right and it can't hurt anything, then I guess there's no reason not to try it."

Other than Inigo's confusion, but he figures maybe he'll just get it the moment he sees it happen before his eyes?