Survivors of the South Tower remembered an unidentified young man in a red bandana who found a stairway, helped the injured, and repeatedly returned to the devastated 78th floor. Months later, Alison Crowther recognized the detail that revealed the rescuer as her 24-year-old son, Welles. His story connects eyewitness testimony, a family object, and one of the most enduring acts of civilian heroism from September 11.