Some of the Brightest Stars Fall the Hardest

EDIT: Please check out my remake of this! ^^ animalpainter.deviantart.com/a…

"Some of the brightest stars fall the hardest, Princess Twilight."

Soooo...this happened! As part of my headcanon. After Sunset Shimmer has returned to Equestria, and earn her wings, later on so does Starlight Glimmer. 

However, the power she gains proves to be too much, and she returns to her old ways. In battle, she manages to strike down Twilight, and she decides to flee from there. Sunset had to choose whether to save Twilight, or chase down Starlight. And of course she chose Twilight's safety. Whether she gets to her in time or not I haven't decided...