Now I get it.dubya wrote:The people brought back from Woodbury were the infirm and young and old who could not go on the run to assault the prison and Tyrese and Sasha who stayed because Tyrese did not want to fight the living.
Rick and his crew had just seen that the Governor has massacred almost all his own fighters for leaving the prison. They brought the Woodbury survivors back to likely save them from the Govenor and/or they could not survive on their own.
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