Talk:For Whom the Sweetie Belle Toils/@comment-1439415-20140301185744/@comment-26973802-20140302061217

Seeing their lack of ability to come up with new villains (for two-parters, that is), and that that arc of the comics seems to be non-canon given the plot holes with PTS (and that "lassoing the moon" I can't see happening in this show), I think that when Celestia and Luna fought King Sombra, Sombra could sense Luna's resentment (because he's all about hate and fear), so before he was banished he cast a curse on Luna that slowly magnified her jealousy and bitterness (being banished didn't stop his curse on the Crystal Empire did it?). She remained Luna for most of it, but when she decided to move against Celestia, this was the final step that enabled her jealousy and bitterness to manifest into Nightmare Moon.