Bruce had been longing, longing not to go into the water, but he's the kind of man who can't help but intervene. He can swim, and he knows CPR-

So he cuts out. Punches the shark, goes for the eyes, all the things you're supposed to do- Hulk isn't there, is just a flicker of gamma under his skin, perhaps an extra thrust in one particular jabbing blow at the skull of the predator.

It begins to sink, bleeding, which can't be good- Bruce goes to check if Komaeda's too hurt to keep swimming, prepared to tow him back to land if necessary, so long as they get there fast. One he can take, but a whole school?

"Are you okay?"