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Someone was throwing stones: Roger was dropping them, his one hand still on the lever. Below him, Ralph was a shock of hair and Piggy a bag of fat. (11.198)
From Roger's vantage point (literally and figuratively), Ralph and Piggy have no humanity. He reduces them to "hair" and "fat," because if they have no identities then he's not really a cold-blooded murderer.
He tried to remember.
“Smoke,” he said, “we want smoke.”
He turned on the twins fiercely.
“I said ‘smoke’! We’ve got to have smoke.”
There was silence, except for the multitudinous murmur of the bees. At last Piggy spoke, kindly.
“’Course we have. ’Cos the smoke’s a signal and we can’t be rescued if we don’t have smoke.”
“I knew that!” Shouted Ralph. He pulled his arm away from Piggy. “Are you suggesting–?” (11.73-78)
Ralph’s ability to think falls victim to the chaos of the island. Only Piggy remains a pillar of reason. So you can imagine what it means when Piggy later gets smashed on the rocks.