Sally's screams only serve to make Leatherface (Gunnar Hansen) and the hitchhiker (Edwin Neal) torment her further, squealing and mimicking her cries. When the gas station attendant (Jim Siedow) says he's had enough and there's no sense in waiting, the hitchhiker suggests that they let Grandpa (John Dugan) do the killing, since he was once the best at the slaughterhouse. The hitchhiker forces Sally to kneel over a tub while Leatherface helps Grandpa hold the sledgehammer. Grandpa's few feeble blows miss Sally, and she manages to break loose from the hitchhiker's hold and leap out a window. She begins running down the driveway with the hitchhiker and Leatherface, his chainsaw buzzing, close behind. She reaches the road just as a large semi passes. Caught off guard, the hitchhiker is hit by the truck and killed. The driver slows down, stops, and gets out of the truck just as Sally, screaming and covered with blood, runs up to him. The truck driver pulls Sally into his cab and closes the door. While Leatherface tries to cut through the door, Sally and the driver scramble out the other side and run down the road. Leatherface tries to follow, but the truck driver hits him with a large wrench. Leatherface drops the chainsaw and falls to the ground, but the chainsaw makes a large gash in his thigh. Although wounded and unable to run very fast, Leatherface continues to pursue Sally. The truck driver keeps running down the road, but Sally cannot keep up. She flags down a passing pickup and climbs into the back just as Leatherface catches up to her. In the final scene, the pickup driver pulls away, leaving Leatherface in the road waving his chainsaw while Sally's frantic cries turn into hysterical laughter.