EE WAS DESCENDING FROM A FIXED LADDER. HIS LEFT HAND SLIPPED: EE FELL APPROX. 4 FEET TO A CONCRETE FLOOR. EE THOUGHT HE HEARD A ""CRACK"" AND FELT PAIN IN RIGHT ANKLE. TWO FELLOW EMPLOYEES STABI LIZED ANKLE: ICE PACKS PUT ON AND EE TAKEN TO EMERGENCY ROOM.