In Chapter 3 regarding Jack's posture and his actions what kind of image does the author is trying to create. and what specific words and phrases heightened that image?

The description of Jack in Chapter Three reminds us of what hunters and gatherers must have been like. He is crouched like an animal, disheveled, and keenly aware of his surroundings.

Jack crouched with his face a few inches away from this clue, then stared forward into the semi-darkness of the undergrowth. His sandy hair, considerably longer than it had been when they dropped in, was lighter now; and his bare back was a mass of dark freckles and peeling sunburn. A sharpened stick about five feet long trailed from his right hand, and except for a pair of tattered shorts held up by his knife-belt he was naked. He closed his eyes, raised his head and breathed in gently with flared nostrils, assessing the current of warm air for information.

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