WORKER WAS STANDING BESIDE AN ELECTRIC MOTOR SUSPENDED BY A 2' WIRE ROPE CHOKER ATTACHED TO T-HEAD BOLT LAID ACROSS FORKS OF FORKLIFT. DRIVER BACKED INTO UNSEEN CHUCKHOLE CAUSING MOTOR TO SWIN G BACK & FORTH WHILE 8-10"" OFF THE GROUND. THE FORWARD MOTION CAUSED THE BOLT TO SLIDE OFF THE TIPPED FORKS & THE MOTOR DROPPED ONTO HIS LEFT BOOT TOE.