User blog comment:Morgause5/Aithusa Evil?/@comment-4135736-20120123130437

I actually think the mistake Merlin made was in Series 2 when he did not reveal his magic and help her himself with her own magic rather than tell her to go to the Druids. This is the biggest mistake Merlin made because that was the reason why Morgana became evil (if he helped her, she would have known the dangers of using her powers for evil and probably would not have been influenced by Mordred, Alvarr and Morgause). The mistake obviously has to put him in danger and cause him trouble in Series 5 so this in my opinion is the mistake the producers were talking about. I bet Morgana will learn that Merlin has magic and that he is Emrys and if there is a confrontation between her and Merlin, she would remind him of the mistake he made and this would haunt him. I also bet she will hate Merlin even more when she thinks that he betrayed his king and did not help her when he had the chance, possibly leading to her targeting him more than Camelot.