My gym was full of young fighters who thought they were immortal—until a 70-year-old man in a moth-eaten cardigan limped through the door on a rainy Tuesday. Tyler, my cockiest prospect, mocked him, mimicked his limp, and challenged him to spar. I almost threw the old man out to protect him. Then he wrapped his hands like a surgeon preparing for battle, and something cold ran down my spine. When Tyler dropped his guard for one split second, the old man stepped in and threw a single hook to the liver. Tyler crumpled like a folded chair. That’s when I saw the jagged scar across the old man’s collarbone—and I realized I was staring at a ghost I’d worshipped since I was a teenager.