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The chase features a motorcycle stunt in which stuntman Ronald "Duffy" Hambleton (credited as Duffy Hamilton) rode his police motorcycle full speed into a fallen scaffold, with a ramp built to his specification. He flew over the handlebars, was hit by the airborne motorcycle, landed in the street on his back, and slammed into the crashed car in which Duvall's character had escaped.[3] According to Lucas, Hambleton was uninjured but angry at the people who came to his aid, worried that they may have ruined the stunt by walking into frame.[citation needed]