EE HAD INSTALLED A ROOF BOLT WITH A G350/3 GOPHER BOLTER AND WHEN HE LET THE AIR OFF TO RETRACT THE LEG THE BOLTER SLIPPED FROM HIS GRIP. HE REACHED OUT TO GRAB THE LEG AS IT WAS FALLING AND T HE WEIGHT AND MOMENTUM OF THE MACHINE PULLED HIS LEFT SHOULDER OUT OF POSITION CAUSING STRAINED TENDONS IN HIS LEFT SHOULDER.