Mort realizes that Shooter is just a figment of his imagination; brought to life through Mort's dissociative identity disorder, and carried out malevolent tasks like killing Chico, Tom, Ken and burning down his house.
Mort realizes that Shooter is just a figment of his imagination; brought to life through Mort's dissociative identity disorder. When Mort fainted or slept, "Shooter" took over and carried out malevolent tasks like killing Chico, Tom, Ken and burning down his house.