This isn't actually a bug I don't think, upon replay. when you hook a fish and run the electricity across the boss it will jolt every few seconds. On first playthough I couldn't tell that the electricty was working though, cause there is nothing to indicate it, so I thought that it was bugging out and only sporatically damaging the boss. It's a little thing, but maybe a boss health bar, or an effect when there is the electricity over the boss, would make it feel more visceral and make it easier to understand. But thats just a little thing and the game is otherwise excellent. 10/10