EE WAS OPERATING THE HELPER SIDE OF A FLETCHER RRII ROOF BOLTER IN THE #5 ENTRY 10 FT INBY LAST OPEN CROSSCUT. HE SWUNG THE DRILL BOOM OUT TO INSTALL THE RIB BOLT BUT SWUNG THE DRILL HEAD OUT TOO CLOSE TO THE RIB. HE HAD HIS HAND ON THE DRILL BOOM, NEAR THE CANOPY POST & ENGAGED THE SWING LEVER & PINCHED FINGER BETWEEN BOOM & CANOPY POST.