User blog comment:Morganaforever/Morgana in series 5/@comment-4814142-20120416195926/@comment-4650675-20120418224733

What if Kilgharrah is the bad guy in the end? He has already tried to kill Merlin and Arthur and destroy Camelot. He also never let Merlin help those in need (e.g. series 2 Morgana, which led to her becoming evil). Also, about a dragon not being able to "resist" a dragonlord's commands, this can easily change. Merlin may temporarily lose his power over dragons, or Morgana may create a spell that makes the subject strong againist draonlord magic and use it to Aithusa. In the world of "Merlin", you never know what can happen from one day to another. Anyway, your explanation does sound logical and I don't think Aithusa would ever betray Merlin, but there is always a slight possibility...