I had known there had been a serial killer on Mount Tamalpais, and it felt so incongruous in such a beautiful, peaceful spot.
Alan Rickman has a huge presence in the Perfume: The Story Of A Murderer and takes an enormous amount of space with no effort. I wanted somebody to leave behind a strong impact and be a threat for Grenouille. When Alan takes to the screen, we immediately know there's an intelligent, instinctive and powerful force, so if he's pursuing our main guy then our main guy is in trouble.