Any one know the story here?
I was thinking, the part in the classroom where Lee finds the paper with the initials T.M.R. and 'walkers found', 'ineligible citizens' etc. could this be referring to the kids parents? It says 2 citizens brought to Crawford, with 1 ineligible found.
Maybe they left him behind for the safety of Crawford. Seems like a possibility, unless there's something else I'm missing?