What does the Lord of the Flies tell Simon they are going to do to the island?

During Simon's internatised conversation with the evil within himself, the 'Lord of the Flies' says a number of things. It tells Simon, "You know perfectly well you'll only meet me down there--so don't try to escape!" It also Tells Simon, that "We are gong to have fun on this island." He is also warned not to 'try it on' or "We shall do you."