So, for a brief period of the Dawnguard quest line from where you change to a vampire to enter the Soul Cairn to where you have to return to Isran with Auriel's Bow, you can actually be a vampire lord whilst still hunting vampires. Am I the only one who found this weird?
I wasn't on the Dawnguard side but even so as a Vampire I never killed so many before (I tried to give them my card but they weren't interested). The Dawnguard shouldn't need to worry they could just sit back and let the Vampires to their job for them.
But yes it's weird , very weird!!!