WELL GODS DAMN IT. I KNEW IT WAS COMING AND I STILL WASN'T PREPARED.
Pretty sure this means Reynir is going to die. I didn't think he would, given the whole word of mouth "no one will die" thing. But, y'know, I don't now how he's gonna avoid it with his Fylgja going poof. He might not have actually seen its corpse so I guess there's some sort of cliffhanger-y hope for the guy, but I don't know whatever else it could mean. In the Sagas, once your Fylgja dies, you're doomed and nothing can save you, you're halfway in the other world already.