A fan was knocked unconscious after falling 21 feet in a stairwell while leaving Rangers Ballpark on Saturday night. The police are investigating it as an accident. The stairwell, near the home plate gate out of sight from the field, consists of a series of flights of steps leading from the upper deck of seats to ground level. "It doesn't appear that there's any foul play that's involved," Police Lt. Bobby Mason said after talking to people who were in the man's group and other witnesses. "There wasn't any fighting or anything like that going on."