ib is not insane,he is a cool calculated killer and very clever
I don't care what you say or think but a " calculated and clever killer " DOES show symptoms of sorts while being cooped up,especially after 30 odd years. There would be symptoms similar to that of a psychotic character-------anxiety,behavioural problems,personality disorder ( anti-social ) emotional instability and a whole host of other symptoms including paranoia too. These symptoms are akin to psychopathy as well.
I don't recollect anything having been diagnosed in JB's case---------Sheila's,yes.