How does Dean Koontz use imagery in Mr. Murder?

Imagery:

"'He contrives to look exactly like you, spouts a lot of strange stuff about wanting his life back, comes armed with an assassin's gun threaded for a silencer, uses burglary tools like a Hollywoodized professional heist artist in a caper movie, takes two bullets in the chest but isn't fazed, loses enough blood to kill an ordinary man but walks away.'" Section 3, p. 194