Even though he was the one who walked away from the conversation earlier, Derek is now looking for Addie and is acting so entitled about it that he walks up to Ellis and demands to know if she has seen her. He has underestimated his opponent. She shoots back that she just saw "Good" Shepherd and that she threatened to quit. When Derek tries to say there are two sides to every story she informs him she doesn't care, and that he has been nothing but a disappointment. There is a nurse sitting behind the desk, directly in between the two of them -- you know she's at her computer, head down, furiously instant messaging a friend all, "YOU WON'T BELIEVE WHAT IS HAPPENING IN FRONT OF ME!" I am no fan of Ellis in general but I do love seeing someone firmly put Derek in his place. She tells him that the residents have an unflattering nickname for him, he's basically a waste of space since he doesn't teach or publish, and that if it comes down to a choice between Shepherds he's totally not going to be the winner.
Charles walks in to the locker room and tells the gang that they don't want to be the next Shepherds, after all. Meredith ignores him -- this seems to happen a lot to the poor guy -- because she's too busy indignantly recounting what Cristina pulled in the OR. Cristina then walks in just in time to hear April say she's dangerous but rather than blow up, she smiles and informs them how well her patient is now doing. Mere tells her she had no business doing what she did, and the two start to argue again about who was right, with Meredith pointing out that Callie sided with her about the technique. Man, her mom really has made her a gutless wonder who runs and hides behind what authority figures think is best. Cristina basically calls Callie Ellis' puppet, so Mere decides to get personal and tells Cristina that they'd be working under Burke if she hadn't driven him away. Everyone seems uncomfortable at this low blow but Alex looks at April, knowing it's potentially about to get a lot worse. Cristina figures if they are going to get personal, Mere should ask Alex and April what they were busy doing in his office earlier. Mere doesn't get it at first until Cristina smiles and raises her eyebrows. Mere whips around to them and Alex tries to deny it all, but April crumbles to dust and starts sobbing and apologizing. Poor Charles is disgusted that his virginal crush has turned out to be a dirty girl, while Mere is crushed that her fiancé is a dirty cheat. Cristina just smiles at Alex, reveling in her revenge.