How does John E. Douglas use imagery in Mindhunter: Inside the FBI's Elite Serial Crime Unit?

Imagery:

"That's what I have to do. Think of one of those nature films: a lion on the Serengeti plain in Africa. He sees this huge herd of antelope at a watering hole. But somehow—we can see it in his eves—the lion locks on a single one out of those thousands of animals. He's trained himself to sense weakness, vulnerability, something different in one antelope out of the herd that makes it the most likely victim...."