EMPLOYEE STATED HE WAS TRAMMING THE #4 MBC INTO THE FACE OF #1 HEADING- THERE WAS A ROCK IN THE ENTRY THAT THE MBC TRAMMED UPON- THEREFORE CAUSING THE DOCK TO RAISE- BUMPED HIS HEAD AGAINST TH E TOP AND BACK OF HIS HEAD AGAINST THE DECK, CUTTING THE BACK OF HIS HEAD BELOW HIS HARD HAT.