On October 6, 1996, approximately 0845 mountain daylight time, a passenger aboard a Colt 90, G-JNNB, sustained a serious injury while exiting the hot air balloon at Albuquerque, New Mexico. The commercial pilot and another passenger were not injured and the aircraft was not damaged. Visual meteorological conditions prevailed, and no flight plan was filed for the personal flight conducted under Title 14 CFR Part 91. The flight originated in Albuquerque on October 6, approximately 0800. On October 23, 1996 the pilot was sent NTSB Form 6120.1/2, Pilot/Operator Aircraft Accident Report. The pilot returned a blank accident report on December 4, 1996, stating he had previously mailed a completed report to NTSB's South Central Regional Office. Attempts to locate this report failed and another report was sent to the pilot on January 7, 1997. The report was received on February 18, 1997. The following is based on the pilot's report and corroborated by an FAA inspector who monitored the Albuquerque International Balloon Fiesta. The pilot and two passengers departed at 0700 and flew at an average height of 1,000 feet agl on a southerly track. After a 45 to 50 minute flight, they made an uneventful landing. The two passengers attempted to disembark while two other passengers waited to board for a second flight. A passenger, assisted by her husband, was in the process of exiting the basket and he stepped on her foot, breaking her ankle.