Gokudera would probably be watching Yamamoto with whatever that blob is he's tossing around and dealing with, as oddly entertaining as that is, but he's still focused on slowly herding the school of fish into shallower water. It's what a lot of sharks of aquatic predators do, right? Hopefully his knowledge of zoology will count for something here.

But catching them is going to be another ordeal entirely. This would be almost too easy if they worked together, or if he could use his weapons. It'd be like using a net, with the way his shields could shift and push the school forward and trap them.