Courtney and Matt are left alone. Matt surprises Courtney with a birthday cake and the two begin to have sex. The killer impales Matt through the chest and chases Courtney downstairs, where he confronts the group, who have just returned. The killer impales Sally with the drill. Sheila and T.J. flee, while Courtney, Amy, and Jeff leave in Jeff's car. Jeff is impaled by the killer, and Courtney and Amy flee back to the house. Sheila and T.J. run to a nearby house for help, but the killer catches up to them and T.J. is killed. Sheila manages to return to the condominium before the killer murders her as well. Courtney and Amy escape but the killer pursues them through a construction site, where Amy falls to her death. Courtney uses a oxyacetylene torch to light the killer on fire, finally killing him.