I don't have a fear factor. Well not much of one. And I'm willing to risk quite a lot - as a comedian you're always risking a lot. You're risking failure especially if you're improvising and going on TV shows trying to make comedy out of thin air. That is quite a risky business.
Music is emotional and you may catch a musician in a very unemotional mood or you may not be in the same frame of mind as the musician. So a critic will often say a musician is slipping.