Final answer:
Flashbacks in a story provide background that enriches character development and plot understanding, thereby deepening the narrative's emotional impact.
Step-by-step explanation:
One effect of the flashback in a story is to create a sense of character history and depth by revealing previous events that inform the current actions or emotions. For instance, in the provided excerpt, the flashback may serve to illustrate the origins of a conflict, show why characters have certain relationships, or explain a character's motivations. By providing backstory through flashback, the reader gains a better understanding of the plot and character development, thus enhancing the narrative's emotional impact.