He was channeling ragnar throught thw whole thing
I pretty much enjoyed the movie, maybe when i watched it in english( i watched a dubbed version my first language is not english), it will change my opinion, but it felt to me i was watching ragnar except with long hair and body armor, exact same type of character.
Its hard to explain but he was arrogant and humorous just like he did in vikings, he even was doing his ragnar grin/smile with the skwint in the eye.