Final answer:
In Chapter 13, Billy is affected by trauma, which is portrayed through the use of line breaks and word choice. The author emphasizes the lasting impact of the trauma on the character.
Step-by-step explanation:
In Chapter 13, the character Billy is affected by trauma. The author uses line breaks and word choice to reflect the damage caused by the trauma. For example, the line break from 'floating' to 'dead' in the poem shifts the tone and captures the impact of the trauma. The speaker also describes himself as a 'ghost' and 'fossilized,' emphasizing the lasting effects of the traumatic experience.