What is the importance of Los Alamitos Racetrack in the book, Factotum?

Los Alamitos Racetrack is the home of quarter horse racing in Orange County, CA. Los Alamitos is where Henry Chinaski dreams he murders an annoying old man, Tony Endicot, who takes Henry and Jan's seats in the grandstands, claims to make $60,000 after taxes in real estate, and flirts with Jan. Henry picks him up by his shirt collar and threatens to push him through the bleachers, thirty-five feet to the ground. Tony sinks his teeth into Henry's ear and Henry grabs his throat and pries his fingers off the bench. After Endicot falls, the sports fans around them study their racing forms and Henry and Jan hurriedly leave. The newspaper reports no murders and Jan assures Henry they do not leave the apartment that day, but the results of the race are as Henry remembers.