"Well, Mia kept trying to kill me. No matter how much I asked her what was wrong and no matter much I tried to comfort her and calm her down, she just kept at it. Then I just, well, snapped. I head-butt her, and I just kept at it until she was unconscious." Tears started rolling down Four's face as she told Grace what she had done. "She'll never not hate me after what I did..."