In "Lord of the Flies", what happens to the Percival when he takes the conch to speak?plz help

When Percival takes the conch to speak, he is unable to get any words to come out of his mouth. He finally must whisper his words to Piggy who then tells the rest of the boys what Percival is saying. This is ironic because at the beginning of the story, Percival's response to everything was to repeat his name, phone number and address. Now, he has forgotten what was obviously very important information that he parents had taught him in case of emergency. Thus, we can see the deteriorating effect of civilization on the rest of the boys through Percival's inability to speak.