The Doctor arrives in search of Ruby, and creates a distraction, enabling her to escape. The Cybermen pursue them both, but the Doctor uses Ruby's holocam to create an illusion of a tunnel wall near a gap in the ice. The Cybermen pass through and plummet to their deaths. One of the Cybermen escapes the trap, but Ruby uses her knowledge of Pah T’wa to fling it through the gap as well. The Doctor is starting to suffer from hypothermia, but Ruby injects him with the same molecular “antifreeze” the Cybermen used on her, saving his life. They return to Snowcap to warn Cutler, but arrive too late; the Cybermen have already conditioned the soldiers in the base to obey their commands. They intend to sabotage the FLIPback field loop, and take over the Earth while the human race is disoriented by the effects of magnetic reversal.