 Bond was strongly opposed to the idea that the murderer possessed any kind of scientific or anatomical knowledge , or even " the technical knowledge of a butcher or horse slaughterer " . In his opinion , the killer must have been a man of solitary habits , subject to " periodical attacks of homicidal and erotic mania " , with the character of the mutilations possibly indicating " satyriasis " . Bond also stated that " the homicidal impulse may have developed from a revengeful or brooding condition of the mind , or that religious mania may have been the original disease but I do not think either hypothesis is likely " . 
