Have you ever seen a bunch of piranhas attack something in water? They just don’t give up. They come in droves. Anyone in water is game. Anyone in distress is better game. The objective is to satiate your appetite. Fair enough, reasonable, and logical. You are hungry and need food. My sympathies, even if they lie with the poor creature being devoured in water, I have no axe to grind with the fish. And even if I had, I’m pretty sure I would do it outside water, someplace safe where I have an upper hand!