How does Michael Crichton use imagery in Next?

Imagery:

"It was true that Henry Kendall had a tendency to be high-strung; his hands sometimes shook when he spoke, especially when he was excited. And he was a bit of a klutz, always stumbling, banging into things at the lab. He had a nervous stomach. He was a worrier."

"Henry Kendall was in shock. There had been a kidnapping right on his front lawn; he hadn't rushed forward to stop it; his own son was sobbing and clutching his mother; and Dave had dropped some guy's ear on the lawn; the other kid's mother was getting to her feet, screaming for the cops, but the Hummer was gone, down the street and around the corner, and gone."