Final answer:
Ralph imitates Piggy in 'Lord of the Flies' highlighting bullying, the breakdown of social order, and Ralph's character shift from a considerate leader to a participant in the mockery of vulnerable group members.
Step-by-step explanation:
When Ralph imitates Piggy in William Golding's novel Lord of the Flies, it is a significant moment that underscores the theme of bullying and the breakdown of social order on the island. Ralph's imitation of Piggy is important because it demonstrates his waning sensitivity and growing cruelty towards Piggy. This moment also marks a shift in Ralph's character from a democratic leader to someone who begins to participate in the mockery and mistreatment of the more vulnerable members of the group, which reflects the broader degeneration of the community among the boys.