DERRICK WAS AT 50% ANGLE. EE WAS IN THE DERRICK MAKING CONNECTION. HE WRAPPED HIS ARM AROUND DRILL PIPE TO LIFT IT UP WHILE THE TOP HEAD WAS ROTATING. IT CROSS THREADED AND CAUGHT HIS COVERALL S IN THE DRILL PIPE AND BROKE HIS ARM. DRILLER IMMEDIATELY SHUT DOWN DRILL RIG BEFORE ANY OTHER INJURY COULD OCCUR.