EMPLOYEE WAS ATTEMPTING TO ATTACH A HAUL CABLE TO A BARGE FOR LOADING. THE SWIVEL WAS LAYING AGAINST THE BARGE AS IT WAS LIFTED ONLY ONE END OF THE SWIVEL RELEASED ITS ENERGY. AS THE EMPLOYEE WENT TO ATTACH THE CABLE THE BARGE MOVED CAUSING THE OTHER END TO OPEN. EMPLOYEE RECEIVED A DEEP BRUISE TO THE LEFT INDEX FINGER.