The girl's ability and her staff not only allowed her to heal angels but to actually resurrect them. This ability had many limitations, and death had to occur while the blood was still warm, otherwise the skill would have no effect.
This was also due to the unique properties of angels. They did not die the moment their heart stopped but because of the decay of energy. After death, it took some time for the energy to dissipate, which was the angels' actual death.
"She brought them back to life?"
"Yes, it's a scary ability, and it's not like the light they worship. They are like dark magicians or necromancers who hide behind masks."
"If I tear an angel apart, will it come back to life too?"
"No, look." Vlad said, pointing to the corpses of the angels below. Those angels whose bodies were damaged too badly could not be resurrected. The girl's power wasn't a miracle. It was just a plausible fake.
Crackle.
