1) Andrew is locked in a classroom with his infected girlfriend Michelle. He chains her up as she requests, knowing he will have to kill her.
2) In flashbacks, Andrew and Michelle try to escape their infected school but Michelle is bitten. Andrew's father tells him to flee with Michelle and not trust anyone.
3) Alone with the now infected Michelle, Andrew struggles with his promise to kill her. In anguish, he attacks her with a monitor but cannot go through with it. They remain locked in the classroom, now both infected.