school—where the Federal Emergency Management Agency has set up a trailer—although the place is likely overrun with walkers. Otis and Shane decide to get the supplies, while Maggie retrieves Lori from the group and brings her to the Greene home. Rick and Hershel discuss the walker epidemic; Rick believes there is no cure, while Hershel has faith that there could be one. The group searching for Sophia returns to the highway, where Daryl reveals that he has a bag containing painkillers and doxycycline antibiotics that T-Dog can take. Shane and Otis retrieve the supplies, but are spotted by walkers. The two have no choice but to barricade themselves in the high school. Production "Bloodletting" was written by Glen Mazzara and directed by Ernest Dickerson. In June 2011, it was announced that Scott Wilson, Lauren Cohan, and Pruitt Taylor Vince would appear on the second season as recurring characters. In an interview with TV Guide, Gale Anne Hurd explained that Wilson's character, Hershel Greene, served as a patriarchal figure for the group. She continued: "He's a veterinarian with a great sense of humanity and a very unique take on the [walkers]." According to Hurd, Scott Wilson was cast because of his "tremendous scope and gravitas". Hurd also stated that Cohan's character, Greene's daughter Maggie, was a woman in her twenties who eventually becomes a romantic interest for Glenn (Steven Yeun). Further, Cohan added in an interview with the Philadelphia Daily News that Maggie was a Christian from a sheltered background. In preparation for her role, she spent a few months in Los Angeles, California to work with a dialect coach. Emily Kinney also joined the cast as Hershel's younger daughter and Maggie's half-sister, Beth. Principal photography commenced in Newnan, Georgia at Newnan High School in July 2011, after approval was received from the city council and the Coweta County School System. Site preparation initiated on July 1, and filming began at the gymnasium of the school over a period of four days from July 7–8 and again from July 11–12. The location was temporarily renovated to mirror an abandoned Federal Emergency Management Agency camp. Michael Riley, the production manager for the episode, contacted the Newnan Police Department to collaborate with producers. Because of the large size of the filming location, Riley's production company notified surrounding neighborhoods, to avoid inconvenience. "Bloodletting" begins with a flashback of Rick Grimes' relationship with Lori, before