THE PRELL HOSE BLEW OUT OF THE DRILL HOLE AND THE AIR PRESSURE CAUSED A ROCK TO BLOW OFF THE FACE FALLING AND HITTING EE'S HARD HAT, THE BAND BROKE ON BACK AT SIDE OF HAT LINER AND CAUSED A SM ALL CUT THAT TOOK 3 STITCHES TO CLOSE UP. EE WASRELEASED FOR FULL DUTY.