How the hell did you let a patient get that far from your watch...
DEREK: "How the hell did you let a patient get that far from your watch?"
MEREDITH: "I turned my back for a second."
DEREK: "He was in the damn gallery!"
MEREDITH: "He's a surgical intern at Mercy West..."
DEREK: "I don't care if he's the Surgeon General. In this hospital he's patient with a head injury who needs a CT. In this hospital he's a scared guy who doesn't need to see the mass of internal injuries of the woman he ran into with his car! This is your fault! You had him and you lost him! You've got to take responsibility for your actions, for once in your life!" [walks away]