In the Lord of the Flies in the passage of the killing of the pig, how does the language by golding heighten the impact of the scene on the reader?

It depends on which pig you mean. Usually the language turns violent and harsh. The killing of the sow is more disturbing. Golding's language matches the brutality with which the boys go about butchering the pig. Golding uses rape imagery to suggest the type of power that the boys inflict. The act of rape is largely about imposing power and humiliation. The boys articulate this, unconsciously, in the scene.