User blog comment:Jamesfury/Red Dead Mythbusters/@comment-3200944-20100621192510

Also, do you have to destroy the lights? I shot most of them, but there might have been a few I missed. And I'm pretty sure the "devil horse" for lack of a better term is just Seth's horse. You go to Tumbleweed with Seth, so it could just be the game messing up and spawning his horse there.