The ER is pure chaos. Hunt explains to Derek (really, to us) that the Mercy West ER closed that morning, and this crowd represents the overflow. Callie shows up looking natty in dark blue scrubs, and the guys congratulate her on being the newest attending (not counting the Mercy West attendings). The group from Mere's room all march in, led by Cristina who asks where Hunt wants them. He tells them anywhere but then a super cute doc in orange scrubs -- the very one who ran past Cristina that morning -- announces that at Mercy West they assign zones to everyone. Cristina pooh-poohs the idea, but Hunt totally stuns her by declaring cheerfully that he likes it. Dr. Jackson Avery introduces himself while Cristina seethes.