The residents show up, Cristina looking for and not seeing Burke, and Callie screams at them to take charge of their interns. They actually listen, and Cristina orders hers off by referring to them as numbers. Mere laughs, and I realize that this is the first genuine smile she's had in a long time -- turns out, she looks kind of awesome when she's happy. George raises his hand, informing them that he does not respond to being called a number. Still smiling, Mere sends him outside to the ambulance. Alex orders his interns to stand against the wall until they're needed, and Izzie continues to try to be a teacher, telling them to expect a lot of action coming in. As she walks away, one of her interns mutters, "I heard she, like, freaked out and killed a guy and had to go on probation." Izzie hears him, and turns around, only to hear another reply that they're stuck with the dud. There was a time I'd have disagreed with that statement, but that time isn't right now.

Outside, Lexie notes that George is an intern again, but promises not to tell anyone. She then asks which one is Meredith, and is surprised to learn that George knows who she is. She also asks what Meredith is like, since apparently her dad won't tell her anything. Just then, Bailey comes out and shouts an order to Meredith herself, so that Lexie can see and stare meaningfully after her. Seriously, there are now about 20 people out there. The interns seem to multiply like rabbits.

Cristina gets to the first ambulance but finds out that the guy was dead at the scene and all they need is her to call it, which is a complete disappointment. Bailey is at the next ambulance, where she's told the patient is a woman 35 weeks pregnant with one arm completely severed. Clearly in shock, the woman asks worriedly, "Did he say arm? My arm is gone? I really need my arm."

Alex gets Ambulance #3, a 45-year-old man with a knee injury. He helpfully explains that the first guy hit a deer in the road, the woman hit him, and then he hit the woman. This is important -- we know it's a no-fault accident, so we can feel for all the patients without having to hate Guy #1 for causing all this bloodshed. It's crucial to get these things set up so that our heartstrings can be appropriately tugged later. As Alex examines his knee, the guy says he's really hungry and asks for something to eat. The interns are completely baffled.

Cristina's about to call her disappointing dead guy's time of death when he takes a deep breath. Shocked -- and I'm sure delighted -- she springs into action. At the same moment, Meredith is running a stretcher inside when Lexie jumps in front of her to introduce herself as Mere's sister. Meredith finally stops moving to stare at her, and the lady missing one arm just kicks it comfortably while Lexie takes her moment in the doorway.