A voiceover (presumably a radio news broadcast) says "everyone still living within the area has been forcibly evacuated. We are continuing to get reports that more and more people are leaving".
If everyone has been evacuated, there is nobody left to leave.
If everyone has been evacuated, there is nobody left to leave.
Characters inside the Quarantine Zone at night wear gas masks with bright lights on the inside. This is handy for filmmakers as we can see the actors' eyes, but as anyone who has looked through the window of a brightly-lit room into the darkness outside will know, they will mostly see their own reflection.