I should clarify. When I said I hadn't seen it before I meant having an event trigger while I was in my longboat in the ocean. I didn't even think that events could trigger around a longboat out in the ocean.

I use the iron sledge, bone mass buff and health potions for when the wolves decide to hunt me. AoE damage, a knock-back and a brief stun works wonders just don't use it close to any buildings etc that you want to keep.