Socrates at the beginning of the eristic debate had made Hippias interpret "polytropos" negatively as "unsimple" and "lying", making Odysseus very bad in contrast to Achilles the truthful and simple. Under pressure, Hippias has had to add "willingly", so that the evil Odysseus lies willingly. Socrates now springs an eristic surprise on Hippias, a double trap emphasizing the ability both of Hippias and Achilles to lie willingly.