Will I have to work on Saturdays? al4a mobile Sian Green and her best friend Keisha Warren were sitting on the ledge of a fountain eating hot dogs 聽at Rockefeller Plaza Tuesday when a 24-year-old taxi driver hit the curb, causing Green to fly up in the air and land with her left foot severed and the other injured.聽 A plumber who witnessed the accident rushed to her aid, followed by famous TV personality Dr. Oz, who tended to Green until emergency rescuers whisked her to the Bellevue Medical Center for surgery.