Tests revealed that the radiation treatment that Bill had received (which, at the time, was not as accurate as it is today) had damaged his spinal cord.
בבדיקות גילו שהטיפול הקרינתי שקיבל ביל (אשר לא היה מדויק אז כפי שהוא היום) פגע בחוט השדרה שלו.