Francis follows.

Logan’s friend follows the runners to the ruins of Washington DC. The environment has been made to appear more rustic than it did in the film because I find it hard to believe that the outside world and trying live in it would be an easy thing when you’ve been pampered and indoctrinated within a type of dream, that’s become a nightmare. One probably wouldn’t be able to survive easily, and so to emphasize the environment you have a much more gritty earth tone on to the scenes that exist outside the city hence the three worlds of Logan‘s Run.