User blog comment:Morgause5/Aithusa Evil?/@comment-95.145.14.97-20120110012031

I think he did it so that Arthur/Merlin/Morgana's destiny can play out as planned. If I remember right, it was hinted in earlier seasons that dragons were somewhat omniscient and in touch with destiny more so than other magical beings. So I think it was used by the producers as a plot device. Besides we all know how Morgana's destined to play a part in Arthur's downfall. As stated before it would be pretty boring if neither she or merlin faced the possibility of death (unlike rest of characters who face the possibility of a mortal death every episode)