I couldn't find "parallel "sensory imagery"
But parallelism in literature is defined as a device used to make moments in literature memorable and alluring.
Learn what makes parallelism such a powerful tool and read some famous
literary examples
Show to sentence so we can see and answer your question :)
Marches.........................
Not sure what the question is but if it is how does the officers statement portray irony it is the fact that they are eating the murder weapon and demolishing the evidence.