User blog comment:Blood Reaper/Skyrim Dawnguard Trailer/@comment-4353017-20120601103506/@comment-98.19.216.17-20120601133922

They didn't blot out the sun.... And if they did they just made it red. Whatever is blocking the sun could just make it where the vampires don't get affected by it but red sunlight still came out in the trailer. Doesn't mean animals and plants won't be affected though.