Lucas is given this paragraph to read and paraphrase. Achilles, a powerful Greek warrior, was thought to be immortal because he had been submerged in the River Styx during infancy. However, because his mother dipped him into the water while holding his heel, he was left vulnerable in that small spot. Today “Achilles’ heel” refers to a weakness that can lead to downfall. Which is the best paraphrase of the paragraph?