Erin hadn't felt this angry in years. There were a hundred things she wanted to say, and the clamor of all those things made it impossible for her to say anything at all. She settled for grinding her teeth and standing up, walking away from Ponyville. The white-hot anger she was feeling for Dr. Edwards was threatening to explode out of her, and the rational part of her mind made her think that some distance from the other ponies would help to prevent an awkward scene. 