RANCHO EMPLOYEE WAS ON THE EL200 TRACKHOE RELOCATING PIPE. INJURED WAS OBSERVING AND HELPING LOEAD THE PIPE FROM THE GROUND. ONE PIECE OF PIPE (JUST THE END OF IT) WAS A LITTLE STUCK IN SOME M UD. WHEN THE TRACKHOE LIFTED THE PIPE, IT BEING STUCK CAUSED THE PIPE TO BOUNCE WHEN IT BECAME UNSTUCK...CAUSING THE OTHER END TO BOUNCE. IT SWUNG & STRUCK HIM IN THE ANKLE.