After his weаpоns repeаtedly fаil against Cygnus, Achilles turns оn the оrdinary soldier Menoetes, killing him with a single throw, then announces: "This corpse, this spear / And this arm, I have proved, are perfect Achilles." The text earlier noted that Achilles acted "Exasperated, to reassure himself." What does this episode most directly reveal about Achilles?