to the house. Their screams prompt Carol and Tyreese outside and all four use their guns to eliminate the walkers. Later that evening, Carol talks with Lizzie about why the walkers are dangerous and why it is necessary to kill them. Lizzie says she understands now what she needs to do. Mika says she does not want to "be mean" by killing people and Lizzie tells her you have to, but only sometimes. Carol and Tyreese leave Judith in the care of the sisters as they go hunt. Upon their return, they find that Lizzie has stabbed Mika with a knife, killing her. Lizzie, looking happy, assures Carol and Tyreese that it's okay because "she'll come back." Lizzie tries to prevent them from interfering by holding a gun on them, insisting that Mika will be okay since she did not stab her brain. Carol calms Lizzie down enough to take the gun away, and asks her to take Judith and go inside with Tyreese while she ties Mika up so she doesn't wander away. Lizzie says she was about to do the same to Judith but Carol calmly points out that, as an infant, she can't even walk yet. Lizzie agrees and goes inside with Tyreese. Carol starts to cry as she mourns over Mika and slowly pulls out her knife to put her down for good. Later, Carol and Tyreese discuss what to do with Lizzie; he reveals Lizzie admitted to luring walkers to the prison fence using rats as bait. It was also Lizzie who made the bizarre splayed rabbit effigy back at the prison. Tyreese wonders if she was the one responsible for killing Karen and David but Carol reasons that Lizzie would have let them turn; however, her uncertain grasp on reality means she still poses a threat to Judith and others. Tyreese offers to take Judith and continue on to Terminus but Carol suggests that it would be unwise to divide their group. They both conclude Lizzie is too dangerous to be around other people. Tyreese says he cannot kill a child, leaving the onerous task to Carol. The next day, Carol asks Lizzie to come outside to gather some flowers for Mika. Lizzie realizes Carol is upset and thinks it is because she'd pointed a gun at her. Lizzie starts crying and saying she was sorry but Carol, now crying also, insists she look