Basically, Carl and Rick are on their own and Rick ends up getting really sick. Carl has to look out for him while he's passed out and that's where the scene was portrayed. I'm really curious what they're going to do with Tyreese now. He was supposed to be beheaded in the prison, but was brought into the series too late. Herschel never made it out of the prison, so its kinda a win-win as far as comic continuity goes. I think they run into Morgan again soon, but I had to refresh my memory.