The producers fired him and replaced him with Peter Deming, who finished the film. To produce the many grisly effects for the film, the producers recruited KNB Effects team Howard Berger, Robert Kurtzman, and Gregory Nicotero. One of their first tasks was the production of a mask for the film's killer. In _his_ script, Williamson had only described the antagonist as a ``masked killer'', which gave Craven no specific information on what type of mask to use or how to conceal the body. <sep>, Pronoun: his <sep>, A: Williamson <sep>, B: Craven