Gokudera wipes at his own face, and then it dawns on him how close Yamamot is.

“Hehehhehaha- Ah... eh?”

With a shout, he is tackled and falls back, swallowing and coughing on a mouth full of salt water. He curses and would swim after Yamamoto, but instead pulls out some mini dynamite and lobs them out after the other. His throwing arm isn’t as strong, so it’s more of a warning set of miniature explosions. Very expressive of his annoyance before he dives under and swims after, hoping it provided some distraction or at least knocked Yamamoto over... or something. Dynamite solves everything.