User blog comment:Morganaforever/DESTINY?/@comment-4582762-20111203084126

I know, but the dragon already knew that Morgana was Uther's daughter and therefore would never work with her for that reason. He could have told Merlin to not cause Morgana's destiny, but he actually did. He told Merlin to kill Mordred, who is the main part of Morgana's destiny, although he didn't mention that at the time.