"Water," Tidus repeats; and while he might not be getting a look, he is getting a note in that ice, isn't he.

"I promise, it's totally walkable! I just need to cast a small water spell, and my pal - he's like a water genius! He can make bridges, flying disks - whole streams of water! Even with just a little water!"

It's magic, Rezo! But also because, probably: "He's made out of water - and he's really good with bridges!"

The most important part, right.