EMPLOYEE WAS STANDING BETWEEN THE MG SETS ON A 1370 DRAGLINE WATCHING THE LARGE REAR DOOR OPEN. THE DOOR STARTED TO MAKE NOISE AS IT NEARED THE OPEN POSITION AND EMPLOYEE FEARED IT MIGHT NOT S TOP AT THE LIMIT SETTING. EE RAN TO GET TO THE STOP BUTTON AND TRIPPED ON THE TWO STEPS LEADING TO THE AREA OF THE DRAGLINE WHERE THE STOP BUTTON IS LOCATED. EE FELL TO THE FLOOR.