I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: 28 Weeks Later Movie plot: During the original outbreak of the Rage Virus, Don (Robert Carlyle), his wife Alice (Catherine McCormack), and four other survivors hide in a barricaded cottage on the outskirts of London. They hear a terrified boy pounding at their door and let him in. A few minutes later, they discover that the infected have followed the boy to them. The infected attack and kill most of the survivors, while Don, Alice, and the boy are chased upstairs. Don pleads with Alice to abandon the boy, but she refuses. He abandons them as the infected break into their room by busting out of the window. Don desperately sprints to a nearby motorboat, narrowly escaping after a tussle with a recently turned survivor. After the infected begin to die of starvation, NATO forces take control of Great Britain. Twenty-eight weeks after the outbreak, an American-led force, under the command of Brigadier General Stone (Idris Elba), brings in settlers. Among the new arrivals are Don and Alice's children, Tammy (Imogen Poots) and Andy, who were out of the country during the outbreak. They are admitted to District One, a safe zone on the Isle of Dogs guarded by the U.S. Army. Sergeant Doyle (Jeremy Renner), a U.S. Delta Force Sniper and his friend, Chief Flynn (Harold Perrineau), a helicopter pilot, are amongst the military presence in charge of guarding the district. Tammy and Andy are reunited with their father, who was found by the U.S. Army and has become the district's caretaker. In their new flat, Don fabricates a lie about their mother's death in order to conceal his cowardice. That night, Andy dreams about forgetting his mother's face, so Tammy and Andy sneak out of the safe zone, and return to their former home, where they begin to collect family photographs and other mementos. To his shock, Andy finds Alice alive and uninfected in a semi-conscious, delirious state. The three are soon discovered by soldiers and taken back to District One. Alice is taken to a quarantine room, where she is tested and found to be an asymptomatic carrier of... My question: Who kills Scarlet?
Answer:
Don