The Ursine Takeover mystery is found in Vithrlockr in Vinland.
Carry the Man Out of Danger
During this mystery you’ll be required to save the norse man from a pack of bears in the camp below. You’ll need to sneak over to the man to avoid alerting the bears, or you can take the bears out before talking to the man. Whatever you do, don’t go charging into the area as the bears will spot you near the injured man and instantly kill him. The death of the man does complete the mystery however the moral thing to do would be to help him, which can be done by carrying him off the ledge up onto the cliffs above. Once you’ve done so you can speak to him to complete the quest.