That terrible hunger only spilled over the edge the moment Isiah murdered all those mages. He couldn't simply ignore the reality that Ciel was in grave danger, sprinting back without hesitation to save the boy.
He was vastly more powerful than those attackers, having sensed their divine energy from a distance and pinpointing their exact location before even stepping inside the institution.
Ever since he became capable of operating through the diabolic core of magic, his physical senses had heightened dramatically, aiding him immensely in tracking down Ciel.
The first two mages he crossed paths with were merely wandering the dark corridors, searching for other defenseless survivors to prey upon.
Lacking sufficient divine energy themselves, they were completely incapable of detecting that Isiah was no ordinary mage, or that he was fundamentally different from anything they had ever encountered.
