They are connected through the shared struggle of the diner survivors.
Charlie and Sandra remain among the people sheltering in the diner. Sandra's breakdown occurs while Charlie's baby is being protected by the group.
They share the same threatened survivor group.
Bob and Sandra are both among the diner survivors during the attacks. Sandra is present when Bob is fatally wounded and when the diner is destroyed.
Michael directly opposes Sandra when her panic threatens the child.
After Sandra breaks her restraints and tries to give the baby to the possessed, Michael executes her.
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