Listen to all that thinking and doing and action up there, leaving Tidus and Gibbs all on their own. A duo who are having their own exchange at the layout and what they could be doing.

Could Gibbs make a waterslide that went through the mess and then pick it up after? --No, apparently it doesn't work like that. What about if we took water magic, and...?

So Roland gives his call, but it prompts Tidus to call back:

"WHAT IF WE MADE A WATER BOMB? WE CAN SPACE OUT THE MESS!"

And also: water bomb.