Explain why Bob is so fascinated by Shane?

Shane is riding into town. The narrator Bob Starrett watches him with a child's fascination. At first Shane's clothes stand out: dark pants, boots, a belt, coat, and hat. The clothing is predominantly black and retains "magnificence." A Shane is a slender man but Bob observes "endurance" and "quiet power." The lines of Shane's face are hardened, suggesting a long and hard past. Bob is struck with the chills when looking at Shane.