 Suddenly, soldiers appear and grab Lexi, and prevent Brad from coming outside.One soldier manages to calm Brad down and explains to him that because he did such a good job sealing up the house, there is no new air to circulate through, but also explains that, unfortunately, containing the virus in an area that has no fresh air flow causes the virus to multiply itself in the air to extreme lethal levels, making the air inside extremely dangerous, all the while the air outside that everyone was scared of was not lethal.Brad doesn't understand what the soldier is saying and insists that they bring his wife back.