CRISTINA: "There you are. I've been looking everywhere for you." PRESTON: "What is it?" CRISTINA: "I need to find this man's leg. The chief is going to kick me out of the program if I don't. I cannot go back to Los Angeles. It's sunny there. Every. Day." PRESTON: [smiles] CRISTINA: "What? I need you to help me find the leg! Aren't boyfriends supposed to help in situations like this?" PRESTON: "When we're on duty, I can't be your boyfriend." CRISTINA: "Okay, fine. So, when we're on duty, I can have sex with someone else?" PRESTON: [pauses] "Dr. Yang... I'm walking away now."