I am a werewolf, after visiting the Vampire lord for the first time and turning down his offer to become a vamp, i go back to the Dawnguard castle and find them fighting vamps. After the vamps are defeated they attack me. WTH? Xbox 360 btw. I thought maybe i accidentally attacked them while fighting the vampires, ao i reloaded the last save and just sat on the sidelines while i watched the dawnguard kill the vamps and they still came acter me after all the vamps were defeated.