How does Anthony Bourdain use imagery in Bone in the Throat?

Imagery:

"Sensing sudden movement, Tommy turned around, thinking Freddy had tripped. He moved to catch him. Instead, he saw Sally coming up with a .22-caliber Hi-Standard pistol. Frozen, he watched as Sally put the gun behind Freddy's right ear and fired three quick rounds into his skull."

"Tommy couldn't do either of those things lately... Freddy's bleeding head, the apron as it soaked through with blood, Freddy's mouth opening and closing the way you see a goldfish do...the images followed Tommy around. He was afraid to dream."

"The gun made a loud fwap-fwap sound as Skinny kept firing, the noise getting louder as the rubber nipple disintegrated."