Twilight Sparkle is practicing transformation spells one day when she messes up and unintentionally kills a good friend. What is Twilight to do now? How can she live with herself?

This is meant to be a short little story so I'm sorry if the description is short >.<

"Swirls" is under attack but by who? She wakes up in Ponyville with no memories and no clues--just a bunch of scars and bruises. Who could have done it? She wanders around until she runs into Pinkie who graciously lets her stay with her and Twilight bandage her up. Will she figure out her attacker? Will she be able to protect herself if she does?