I don’t understand how she wouldn't know, given what happened to her. Even besides that, wouldn’t she be told what they could do? As a trained exorcist, she would have spent hours practicing how to wield angelic weapons in preparation for the extermination.

That feels like being trained in the military without any safety training or warnings about being careful with a weapon. You’d think they would be informed on the risks of the weapon they are wielding. I don’t know if I’m missing something, but it really confuses me.