The description as seen in the deviantart page:
 
Starlight Glimmer went to a secret anime costume party dressed up as an evil Saiyajin / Kaioshin / who knows what. On her way to the costume party (hosted by the closet otaku Fluttershy) she found a cart of apples and decided to grab few couples to fill her stomach. Starlight Glimmer did not kill the pony who was pulling the cart and certainly did not drag his/her body into the basement behind that boarded up house on the top left corner. Please ignore the pool of blood or the blood trail that leads somewhere off screen. No pony was harmed I assure you