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.
Bob's final defense indirectly protects Charlie and her child.
Bob remains with the diner survivors while Charlie gives birth and helps create an escape opportunity by sacrificing himself and destroying the diner.
They become critical defenders of the diner and its survivors.
Michael arms the patrons and leads them during the attacks on the diner. Bob later helps the escape by igniting the diner's gas main.
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