What is Defoe trying to symbolize in having Crusoe bring Friday with him to Europe at all?

During the return voyage to England from Lisbon at the end of the novel, Crusoe and his traveling party encounter a bear that is frightening until Friday turns it into an amusing spectacle. His teasing of the bear, which prompts the group’s laughter, is the first example of live entertainment in the novel. There is no mention of Friday trying to amuse Crusoe on the island. Does this episode foreshadow a new role for Friday after he moves to Europe from the Caribbean? What is Defoe trying to symbolize in having Crusoe bring Friday with him to Europe at all?