2 EE'S HAD JUST SET UP FOR THE 1ST ROW OF BOLTS IN THE #4 FACE. EE WAS ON RIGHT SIDE OF BOLTER. HE HAD DRILLED THE HOLE FOR THE 4' BOLT NEXT TO THE RIB. A ROOF ROCK FELL BETWEEN HIS ATRS AND T HE RIGHT RIB STRIKING THE PLATE ON THE BOLT RESTING IN THE DRILL POT. THIS CAUSED THE ROOF BOLT TO WHIP SUDDENLY STRIKING EE IN THE PALM OF HIS RIGHT HAND AS HE WAS REACHING FOR THE ROOF BOLT