EE WAS CHANGING A DRAG CABLE ON A DRAG LINE CRANE. EE WAS MANUALLY PULLING APPROX 25' OF CABLE AT 5 LBS PER FOOT OF CABLE. THE CABLE WAS ON A SPOOL WITH A BAR FED THROUGH HANGING BY CHAINS ON A LOADER. WHILE FEEDING THE CABLE UP, THE CABLE LOOPED, CAUSING A SPRINGING ACTION REVERSING DIRECTION OF CABLE. EE JERKED HIS ARM TO GET FREE CAUSING TORN ROTATOR CUFF.