How did Holden imagine he would get back at Maurice?

Holden finds himself way over his head in this set of scenes, having been set up with a sex worker, Sunny, by her pimp (and elevator man) Maurice. Maurice tells Holden that he will have Sunny take care of him for five bucks. When she arrives, Holden finds that he would much rather just talk than anything. This isn't the job Sunny has signed up for, and she becomes incredibly frustrated with this turn of events. Eventually, she demands her money, and Holden offers her the five dollars he was quoted by Maurice. Not surprisingly, Sunny changes the terms and ups the fee to ten dollars. Holden refuses to pay, and Sunny storms out but returns with Maurice. After Holden calls him a "dirty moron" (with the addition of a colorful modifier), Maurice punches him in the stomach, takes the money, and leaves.
It is at this point that Holden imagines himself in some movie, having taken a shot to the stomach and taking revenge on Maurice by shooting him as well. In reality, he lies in the floor crying and contemplating suicide.