Daniel Keith went through a dramatic transformation for the role of Rambler.  Losing 30 pounds, shaving his head, sitting through several hours of prosthetics, Daniel isolated himself building the history and mind set of the character.  He worked with a Cockney dialect coach chosing to integrate a forced high brow tone.  He and Francesco Nuzzi worked with stunt and fight coordinators for months for their big agresive fight sequence at the end of the film.