Yeah, it appears errors were made on my part. Arne should be at (23-16) 7 hp, + 5 from Cedwyn puts him at 12. Now, he has still taken a major wound and is still badly injured. He will need chirurgery to recover, and he still sustained a loss of CON. But he is not on death's door.
Not sure what happened... maybe I looked at a Saxon HP thinking they were Arne's?
Anyway, that's the joys of learning a new system.
So, Arne is still unconscious, still has a major wound, but is not as close to death as originally posted. Same rules apply for transporting him - he'll take additional damage depending on how you get him to wherever he needs to be, and that will continue until he is at 13 hit points or better.