As Meredith walks out of the hospital. After a long 48 hour shift. Meredith and Derek walk out of the hospital Derek tells Meredith to " have a good night" . Izzy and George had already left for the night but Meredith's surgery ran long.
As she walked out to the back parking lot. Meredith thought someone was following her. But Meredith turns around too see no one there.