Although Karina is highly distrustful of Mason, her former captor, the two of them team up to evade the Scavengers. Mason observes that Karina possesses bizarre powers granted to her by the virus; when experiencing strong emotions, she involuntarily produces an explosive effect that creates mass destruction while leaving her unharmed. Mason and Karina eventually succeed in radioing the Alliance for help, only to learn that Colonel Stockton, the Warden of "the Anvil", has ordered the Alliance to nuke the area and kill everything that moves, supposedly to contain the infection and prevent the spread of the virus. Karina is soon captured by Alliance Security, and Mason finds himself fighting against the very organization he works for.