Carl used to be a simple farmer looking after cattle for many years alone until the chief offered him a deal he couldn't pass up, marriage to a beautiful woman from the main village, but in return he owed him a life debt.
This meant the chief could call upon him to fight at a moments notice. The first time he was sent out on a raid he finally fought for something more than himself, fresh off the boat he held off 5 men sending them to their 'God'. Carl is a believer in the old ways he makes sure to cry out his name upon each kill so those around him sent to Valhalla would know his name.
So by the time he is finally carried off by Valkyries he will have a space reserved in the feasting hall already.