Later, Derek says he wouldn’t have picked Cristina to be a part of his life. She probably wouldn’t have picked him either. But things happen and now they are family. That means he worries about her. Derek tells Cristina she’s flaming out and that’s not okay. He helps her practice surgery on a cadaver. They work together so that Cristina can get her surgical mojo back, one incision at a time.
Derek meets up with Amelia outside the hospital. He gives her the details of what happened the night their dad died. She was five at the time. Amelia tried to lunge forward to reach her dad after the robber’s shot him. But she couldn’t move. That’s because Derek was holding her so tight. He was protecting her. He’s still trying to protect her by not telling her about his pain from getting shot. And that’s why big brother never returned little sister’s calls.