How does Tony Hillerman use imagery in The Dark Wind?

Examples of Imagery:

"His 'chindi' had slipped away to wander in the darkness - one more ghost to infect the People with sickness and make the nights dangerous."

"Toward my feathered arrow, the man West turns his side.
That my black bow will bless him with its beauty.
That my feathered arrow will make him like the Talking God."