Answer and Explanation:
1. The author uses the point of view in the first person, making Juvencio narrate his perspective of the story, since it shows what Juvencio thinks about the situation he is living and how it relates to a situation he lived in the past. With this the author presents a more personal narrative, where the reader can understand Juvencio and his construction as a character.
2. The change does not significantly affect the tone of the narrative, since this change occurs in a balanced way and in accordance with the objective intended by the author.