Rick finds out that the bullet has separated into 6 pieces and they need standard medical equipment to try to save Carl. Shane and Otis (the man who shot Carl) got to the local high school to find the supplies. Lori gets to the house and finds out that the man treating her son, is not a doctor, but a veterinarian.
While trying to get the medical supplies Shane and Otis are surrounded by zombies and have to lock themselves in the high school. Carl doesn't have much longer to hang on and needs the surgery soon.
Opinion: This episode was just okay in my opinion. It seemed very scattered and the fact that both the children in the group are suffering makes it just messy. I have a feeling that the lives of the two children will be the focus of this season. Even worse is that I am a mother and usually things like this pull at my heart strings. In this case I am not moved at all.
I am hoping that as that the rest of the reason gets better. Remember there is only six episodes per season and they are up to number 3, but I haven't seen that one yet. Even Darryl in this episode has done a 180 from the last. It's almost like different people wrote the two different episodes.