OPERATOR SAID THAT IT WAS A FREAK ACCIDENT IN THAT HIS FEET GOT TANGLED UP IN THE STEP. (RAINSTORM MAY HAVE CONTRIBUTED TO A HURRIED EXIT FROM MACHINE.) STEPS WERE INTACT AS IN NEW FACTORY CON DITION. HUMAN ERROR APPEARS TO BE THE CAUSE OF THIS INJURY IN THAT AS LATE AS 7/22/02 SLIPS AND FALLS/3 POINTS OF CONTACT WAS OUT MONDAY MORNING SAFETY MEETING FOCUS.