Hickey's character sure has changed after the last episode. Looks like suddenly he went as loony as the Doctor. I don't know a lot about the effects of lead poisoning but I do know dementia is one symptom, however, I never heard of it manifesting suddenly like it's happening here. It's seem more for dramatic effect that first the Doctor, and now Hickey, both suddenly went suicidal and homicidal, respectively. Not having read the book, I wonder if the build up to this occurring was set up more gradually?
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