Describe what happens to Piggy in this chapter after the conch breaks?

Above on the mountain, a frenzied Roger deliberately leans his weight on the log that Robert showed him earlier, dislodging a great rock, which begins to roll down the mountainside. Ralph hears the rock falling and manages to dodge it, but Piggy can neither see nor hear its tumble. The rock crashes down on Piggy, crushing the conch shell, which he was holding, on the way. The rock pushes Piggy down a cliff, where he lands on the beach, dead.