Something relatively similar happened to GSP. Anderson Silva was submitted part way through dominating a fight, Mauricio Rua got tko'd from a takedown by Mark Coleman, Brock Lesnar got humiliated by walking in to a kneebar, and BJ Penn somehow just lost to a decision to a guy from a lower weight class. Anything can happen in mma, and while Duffee will probably never be a dominant champion, he may yet have a good or even a graet mma career ahead of him. Don't count him out yet!