Obviously, nobody is invincible, but the closer a fighter looks to being unstoppable, the more he gets paid. I wonder if there is something in our psychology that makes us want to believe that some humans are above being mortals, maybe because we like to believe in miracles and unexplainable phenomenons. I remember when RJJ got KOd, I was shocked, but is it really surprising when any fighter gets KOd by another elite fighter?