The shooter of the chained infected is revealed to be Colton, Gabi's boyfriend. Colton and Gabi embrace, relieved to have found each other. Colton admits he thought he had lost Gabi "when the bombs fell." He enquires after Gabi's sister and Sierra. Gabi say's Sierra is the reason she reached the construction site alive. Colton thanks Sierra and Gabi says her sister is dead because they waited too long. As Sierra picks up her dropped knife, Gabi and Colton embrace again, while Gabi says she and her sister waited because she thought Colton was coming for them. (thetvdb.com)