As Derek works on screwing a plate to Charlie's skull, he explains to Lexie something about a muscle that is going to atrophy from lack of use. He pointedly tells her it's too late for this muscle, because it missed its chance to attach. Mark is thoroughly confused but Derek just tells him that this is a teachable moment and he should stay out of it. Derek goes on about the poor, unattached, withered, fat-hugged muscle and Lexie finally seems to understand that this is all advice in code. Honestly, this metaphor is way better than "the test is a mirror." Unfortunately, Mark does exactly what Bailey predicted and seemed to use this metaphor for his real life -- he tells Derek he got the message loud and clear, and thanks him. Everyone is confused and a little bit surprised including Derek, since he has no idea how Mark could think that was advice for him.
As Callie, Bailey and Teddy look at some scans, Arizona comes in and tells Callie about how they totally didn't have snack today but stops chatting when she sees everyone's sad faces. Callie tells her gently that they did a PET scan and there are mets all throughout Nick's body, including his heart. Ah, that explains why Teddy is there. Bailey tells her quietly that there's very little they can do from here on out. Arizona is horrified and finally just leaves without saying a word.
Meredith's voice is extremely deep as she tries to give an answer but finally, she just gives in. She quickly tells the examiners that she is sorry and then pulls back her hair and barfs into a garbage can she found nearby. As she does, the examiners look thoroughly revolted.
Cristina, meanwhile, sounds almost bored as she tells Feeny how she would perform a procedure. He keeps asking her questions, trying to trip her up, and her attitude starts to rear its ugly head once more as he tells her he thinks she should do it a different way. She informs him that she's done this procedure a dozen times but he evenly replies that he's done it at least 1,000 times. She gets all passive aggressive in response and agrees to do it his way but with the tone of her voice saying she thinks this is totally wrong.