AJ was bullied. That may be nothing now, but the fires of taunting and teasing around her left deeper burns than anyone thinks. For all these years she hasn't spoken a word. She grins and laughs and does her best. But her hurt is more strong than any person thinks. But what would you expect with her once being the only earth pony in a school full of Pegasi? One day, it really gets to her, but as always she keeps it safe. But RD seems more rowdy that same day, and after they are left alone together with RD endlessly teasing her and punching her like mad for a whole hour AJ gives in two what she held in. In her final words before running off, she vowed she would either fly or she would test all her limits to death. Literally.