 He retains some degree of integrity however; Harry attributes his loss of ability to the fact that he privately hates what he does.He does retain some degree of contact with the spirit world, however, and his knowledge of such matters is considerable; he is able to provide Harry with some useful insights into the situation when Harry approaches him during the events of "Grave Peril".By the events of "Death Masks", Lindquist has apparently changed his ways to some degree and his abilities are returning.