Stockton attacks Mason to ensure that there is only one virus carrier, and Mason succeeds in killing him and retrieves Karina. Karina pleads with Mason to escape together with her far away from the conflict, but surprisingly Mason betrays her by turning her over to the Shroud. Mason is revealed as a traitor to the Alliance who has been collaborating with the Shroud from the start. His task was to retrieve Karina and deliver her to the Shroud. After turning Karina over, Mason questions the Shroud about his daughter, who had died some time prior to the game. The Shroud hint that they have the ability to bring the dead back to life but insist that Mason perform more "errands" for them before he will be allowed to see his daughter again. Mason then realizes that the Shroud will never honor their end of the bargain, and goes on a one-man rampage through the Shroud outpost using his viral powers and the "Titan's Fist". Mason defeats a few dozen Shroud soldiers, finally killing a mysterious viral-powered Shroud woman protected by several Shroud assassins. After finally reaching Karina, he finds her connected to medical equipment draining away her blood. Shroud soldiers close in on the area, and Karina tells Mason that he cannot rescue her, begging him to euthanize her. Mason cannot bring himself to kill Karina, and instead shoots himself. As Karina watches Mason die, her out-of-control emotions produce a massive energy wave that envelops Mason's body and obliterates the Shroud outpost killing everyone.