Doing this with Gibbs is a lot more work than it looks, though it's fortunately the kind that still puts more of the effort on the higgledy- not a high ask, when it's concerning the skill and control of water of a water-aligned being. But it's Tidus who has to keep the water in motion, which for him just means in its summoning state; a small obligation in actual energy, but its the continuous part of it that Tidus needs to keep going.

So, he should really care about how high or not high they are. Right? When he hears that worrisome call to him from his pal, his buddy, his old man of the train-

"Higher?" He's not even sold behind the idea as he says it, but there's something about the moment itself that convinces him; that in-the-moment recklessness that might be all him, might be more Gibbs than will ever be known. "--Higher!"

And higher they go, a burst of water growing louder in their ears, the world below them stitching closer together, more detailed the farther they get. But Tidus isn't looking down but up above, the way ahead when their travel starts to arch. Eventually, when Gibbers feels like it.