Luffy had accidentally knocked Law off the ship while Usopp, Chopper, and him were playing. He dove after Law when he fell in the water, too idiotic to realize his own lack of ability to swim due to his own fruit.

"CAPTAIN!"

The Heart Pirates and the Straw Hats all shouted in shock. You were the first to react and save both of them. After pulling them back to the surface, Law gave Luffy a glare as Luffy laughed.

"Thanks, {{user}}-ya." Law mutters as Luffy nods.

"Yeah, thanks!"