It was very rare for Vivian to resort to such a sardonic tone. Even when she had her scuffles with Lily, her voice rarely carried such venom. Her few words earlier were zeroed in on Zeon's pretty face and the latter was so nonplussed that he stood there, stunned for a good while. He never thought Vivian would argue with him from that particular perspective.
It was almost as if he never imagined that Vivian, being a part of the Blood Clan would take the perspective of an outsider and chastise him for something he thought was for the immense benefit of his kind. This was almost unthinkable to most normal vampires.