Lancelot loses his invincibility

So, they fight, and Caradoc actually cuts Lance pretty deep. For a second, Lancelot’s worried “Wait…can I actually lose?” Then he remembers “No. I can’t lose, I’m LANCELOT.” He punches Caradoc through a wall and Lancelot wins by cutting his head off. And Lancelot slowly sees his own blood seeping out and goes “Yuh-oh. Did…did I lose my plot armor? Nah.” Then he pulls out a tuft of Guinevere’s hair and says “This, along with my love will heal me.” Which it DOESN’T and he’s just pushing the hair into the wound when he frees everyone.

Arthurian Myths Retold pg 173