No reason whatsoever...
Sounds like a bald toupee salesman wearing his own product.
Pentecostal exorcist Bob Larson blessed by Rome's Chief Exorcist
Exorcist Puts On A Show
Meet the exorcist schoolgirls who spend their time casting out DEMONS around the world (Bob Larson)
Yeah, if he can’t think of a reason, then he is ill-prepared to distinguish a real possession from a false one, and shouldn’t be doing exorcisms in the first place.