How did the boys show savageness in the book Lord of the flies?

Words alone signify little but in the context of sentences they convey much more. The savagery of the boys is alluded to in the following sentences, and I quote... "Between the flashes of lightning the air was dark and terrible; and the boys followed him clamorously." "Piggy and Ralph, under the threat of the sky, found themselves eager to take a place in this demented but partly secure society." "At once the crowd surged after it, poured down the rock, leapt on to the beast, screamed, struck, bit, tore. there were no Words, and no movements but the tearing of teeth and claws." Three single Words that suggest the savagery of the boys might be; demented, screamed and bit.