It's true. Rarity DOES look evil. I know what's going on! She's about to turn into Nightmare Rarity once again! But Spike will eventually manage to save the day and turn her back to normal like he did the last time this happened! And she'll reward him by agreeing to go out with him! Meanwhile, Sweetie Belle is completely oblivious to this, thinking they're just having fun messing with him! That's what's really going on here!