The group only travels for a few hours before camping for the night. As Mark sleeps, he recalls how he and Trina ran deeper into the subway tunnels, convinced someone is following them, using only the light of his cellphone to guide them. Trina finds a box of instafood that Mark carries, and they hide inside a small room off to one side of the tunnel. Unbeknownst to them, Mark and Trina have taken refuge in a room filled with homeless people. One man threatens Trina as the others approach. A man bursts through the door and attacks the homeless people. He is the man who has been following Mark and Trina. He introduces himself as Alec.

Back in present time, Alec makes a quick breakfast, and the group begins walking again. At midday, they stop by a stream. Trina wanders off to use the bathroom and Mark follows. Trina insists they are both healthy and that it is safe to touch; they embrace and kiss. The group continues walking for several more hours, then they set up camp. Mark lies awake as the others sleep, thinking about his life before the solar flares and about his sister, Madison.