If these new vampires are Volkihar, then why are they using fireball spells? They're suppose to have icy breath, pull victims under frozen lakes. I see more potential for arctic features than fire. Hmm. Hopefully, these aren't generic Cyrodillic vampires.
That didn't occur to me. But then, nobody said becoming a vampire, even one with ice powers, would make you forget any spells you knew before you turned.
I did notice that they laughed at him after the fireball, which made me happy. I assume "normal" enemies don't giggle with anticipation at the thought of their next kill, which is appropriately sinister for them. If memory serves, they never had unique combat dialogue/sounds to distinguish them from the average bandit.