I did not see that coming. My first thought was why is the car door locked. IMO Carol should had just kept her mouth closed and not said she did it. I hope they don't keep her character away too long. She seemed to be one of the few left with her head on her shoulders straight.
If Lizzie is feeding the walkers the rats, it will be interesting to find out why she is only feeding them the heads and not the bodies.
We will see, I may be wrong, but I'm sure it is not Lizzie! Maybe Bob... something about him does not add up!
