How does Timothy Zahn use imagery in Heir to the Empire?

Imagery:

"To safety. Leia gazed at the house, a shiver running up her back. And wondered if there would ever again be such a thing for her as safety."

"Through the mists ahead a well-remembered spot loomed, and he found himself gripping his lightsaber all the more tightly as he neared it. On this spot, once, he'd fought a nightmare battle with a shadowy, unreal Darth Vader...."