DURING THE PROCESS OF ADVANCING UTILITIES THE HEADER WAS IN THE PROCESSS OF BEING REMOVED WHEN THE CHAIN THAT SECURED THE PIPE TO RIB HAD CAME UNHOOKED FROM THE RIB. THE OPERATORS GRAB THE PIPE TO KEEP IT FROM SLAMMING THE GROUND WHEN HE HAD FELT A POP IN HIS LOWER RIGHT BICEP. RESULTING IN A PARTIAL TEAR TO THE BICEP.