The film's most recognizable image—the Exterminator stalking gang members in a flameproof welding mask—was reportedly born from a scheduling crisis rather than the original conception of the character. Robert Ginty was committed to another film and could not return for extensive Los Angeles reshoots, while Cannon wanted additional action and horror material. William Sachs later explained that he solved the problem by transforming the character into a masked figure whose face would rarely need to be shown. A brief piece of existing footage showed Ginty lifting a welding mask while working on the garbage truck, and Sachs repurposed that material as the visual justification for keeping the mask on throughout the new scenes. Ginty's stunt double performed much of the flamethrower action and other shots in which the actor's face was hidden. The same substitution extended to the film's emotional climax: the shot of the Exterminator rushing to Caroline's home after her murder was filmed with a double, and a body double represented Caroline's dead nude body because Deborah Geffner was not brought back for those additional scenes. The released movie consequently became a patchwork in which the star's absence dictated the character's mythology, action style, and even portions of the tragic storyline.
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