Events for Loss of Power
We see loss of power on page 99 when it says "The assembly shredded away and became a discursive and random scatter from the palms to the water and away along the beach, beyond night-sight." You can see loss of power because everyone in the group broke away, even though Ralph was still chief. Also on page 101 when Piggy says "I had the conch,... I had a right to speak." meaning he HAD the conch, yet no one listened to him, meaning even the conch lost it's power.