|Sometimes you smite a demon; sometimes the demon smites you.|
Novatian was, of course, ordained, and like so many other leaders in the Church at the time, he campaigned for orthodoxy based on his own theology. He scrapped with a man named Cornelius over who was the legitimate pope. Cornelius won, but Novatian stuck to his claims (becoming the second anti-pope) and divided the faithful.
None of this has much to do with Hypatius yet, except that as bishop of Gangra he was a staunch supporter of what we've come to understand as fourth century orthodoxy. After defending the faith at the Council of Nicea, he was attacked by Novatianists on the way back to Gangra. They beat him senseless and threw his body into a swamp. Then a woman in the group hurled a stone at his head, inflicting the coup de grace.
Surely a woman who kills a saint must be possessed by a demon. And just as surely, that demon will turn on its host. The woman began to strike herself, and did not stop until the saint's body was recovered and properly buried. Only when her family took her to the saint's grave did the demon leave her. His grave, and later his exhumed relics, continued to provide miracles of healing.
The picture above shows the saint happily on his way home. Then it shows the dragon that he dispatched for Emperor Constantius, thus providing access to a treasure hoard. Finally it shows him on the ground, about to be skull-split by a stone-chucking Novatianist woman.