>European exorcism is very different from Japanese exorcism
I really hope the nun's "corruption" didn't weaken the power of her skills, because she seemed like a genuine expert who simply accepted a case outside her skillset.
Finally someone address what would happened if a cultural/belief system tries to exorcise something out of their own area of demonology. Like a Shinto priest or miko trying to exorcise someone possesed by beezlebub or an Arabic genie.