It's no secret that Cristina and Owen are having major problems. What their colleagues don't know is that the two of them are faking the flu in order to stay home to discuss Owen's infidelity. Cristina wants all the painful details. Needless to say, Owen is reluctant to give them to her. But give them to her he does. This causes Cristina to sob uncontrollably. She then locks herself in the bathroom.
A worried Owen tries to break down the bathroom door just as his wife opens it. The two of them laugh about this momentarily, but then all the pain comes rushing back. Cristina ultimately believes that the reason Owen slept with another woman is because he was still so hurt about her abortion. He wanted to hurt her back. After this unsettling revelation, Owen packs a bag and moves out of the firehouse.
Chief Mark Sloan calls a staff meeting to order. You heard us. Mark is temporary supreme leader. Owen asked him to pinch hit as he deals with that nasty "flu." Mark is really into the gig as evidenced by all the motivational quotes he has Jackson distribute. He also schedules a "Beef with the Chief" lunch hour so that his charges can voice any concerns. Speaking of concerns, Derek has some about the spinal repercussions for a patient who needs titanium hinges put into his jaw. Mark challenges his pal to rise to the challenge before him.
Derek wants to carve some foam to rest the patient's head during surgery to reduce the risk of respiratory complications. It's a good idea, but not good enough for the temporary Chief. As Derek gets the scoop on Cristina and Owen from his wife, he finally figures out a way to stabilize his patient's neck. He'll use beanbags, just like the ones they have in Zola's daycare. Looks like Derek rose to challenge just as Mark had asked.