THE INJURED AND FOUR OTHER CREW MEMBERS WERE MANUALLY ROTATING THE CUTTER HEAD OF THE CONTINUOUS MINER TO CHANGE BITS. AS THE HEAD ROTATED A BIT CAUGHT HIS KNEE PAD AND PULLED HIS RIGHT LEG UN DER THE CUTTER HEAD. THE NEXT BIT PUNCTURED HIS RIGHT LEG ABOVE THE KNEE. COMPLIANCE NOT A FACTOR. INATTENTION TO ACTIVITY A FACTOR.