EE WAS ATTEMPTING TO REMOVE A BOLT FROM A DRYER TRUNION BEARING USING A STANDARD 3/4"" DRIVE RATCHET. THE BOLT WAS SECURELY FASTENED & DIFFICULT TO LOOSEN. THE EE EXERTED ADDED FORCE TO THE DRIVE RATCHED BY HOLDING THE RATCHED HEAD WITH HIS LEFT HAND & THE HANDLE END WITH HIS RIGHT HAND. THE BOLT SUDDENLY LOOSENED & THE EE'S RIGHT SHOULDER & ARM SUSTAINED THE SHOCK AS THE