RE: the guy on the road. We don't know anything about him, he could be a wizard like someone suggested, or just some lucky guy. Perhaps he decided to not fight the zombies anymore because Rick and co. left him stranded. Living alone in a world like that would take it's toll. Maybe he figured he'd rather die then spend another day alone. Rick from season 1 or 2 would have at least given him a fair shake. What they did to that him was only better than what someone like the governor would have done to that guy.