INJURED WAS WALKING DOWN THE EAST STEPS BETWEEN THE 4TH & 3RD FLOORS. WHEN HE STEPPED ON THE CONCRETE SLAB THAT IS MIDWAY BETWEEN THE FLOORS HISFEET SLIPPED OUT FROM UNDER HIM AND HE FELL. HE THOUGHT THE FLOOR WAS WET BUT IT WAS COVERED WITH A LAYER OF ICE. HE TRIED TO CATCH HIMSELF WITHHIS ARM. HE FRACTURED HIS RIGHT DISTAL RADIUS.