Ooh, it's time for the Great Izzie Experiment. Addison tells Izzie that she's leaving for the evening, but she and Burke have decided to try again with Emily's aorta if she can only make it through the next ten hours. She asks Izzie to look after her for the night. Izzie says she was on call last night, but at Addison's look, is all, "But I can definitely stay tonight, too." Addison tells Izzie that this baby is her responsibility, and she better be alive when she gets back in the morning. Izzie says she will be. Addison walks off with a guilty look on her face. Aw, Addie, you schemer. Izzie almost deserves it for the way she's been acting.

Alex catches McDreamy as he's leaving the hospital, and says he thinks he found something that could work on APCM. McDreamy shuts him down. Alex tries to argue his case, but McDreamy tells him it's over. "You screwed up. Mr. Martin's fried. You fried his brain. You killed him. Deal with it." Well, then! I guess he just...will have to!

Izzie rocks the NICU. Emily's blood pressure has dropped, but Izzie works some medical magic and brings it back up to the right level. The nurse assisting her is all proud. Mere walks in and says, "Hey, Iz." Izzie says she's not talking to her. Mere says she just wanted to say she was sorry. Izzie: "When Derek broke up with you, nobody told you you were better off without him. It's not supportive, it's condescending. Everyone was there for you guys, and the one time I need you? Just go away, Meredith." Meredith does, and Izzie looks like she wishes she hadn't said that. Too late now, weirdo!

Cut to Cristina, running into Rosanna's room. Rosanna is all jerking and spazzing on the bed. The nurse says she just started seizing. Cristina realizes that Rosanna isn't seizing, she's choking. She reaches into her mouth and pulls out a bloody shard of something from her throat. Cristina looks around the room, and sees a broken lamp on the floor. "My God, she's swallowed a light bulb." Cristina tries to shove a tube down her throat as we go to commercial.

When we come back, everything is still crazy and tense and awful and making me nervous in Rosanna's room. Cristina can't intubate, and calls for help. She's preparing to do something called a "crike" when Burke shows up. He says she'll be okay, and tells a nurse to prep OR 2 for an emergency thoracotomy. Cristina sighs in relief that her hot doctor boyfriend has saved the day.

Emily crashes. Izzie fixes it with more epinephrine, and heaves her own sigh of relief.