Bjorn rescuing King Harald
How fucking dumb can he be? this man has clearly stated he intends to takeover Kattegat, he's been plotting it for years even going back to when he first met Ragnar. Why the hell would you go and risk your life and alot of your men just to free a man you will likely have to fight over your kingdom with?
Bjorn is proving to be a very dumb king, just walking right into a trap in the water like an idiot wasn't very smart either.