EE WAS HANGING OUTBY END OF WING CURTAIN IN #6 ENTRY. LEFT BOLTER WAS IN LAST OPEN BETWEEN 6-7. BOLTER CABLE WAS HUNG ACROSS #6 ENTRY OVER HEAD OF HELPER WHERE HE WAS HANGING CURTAIN. BOLTER O PERATOR STARTED HIS MACHINE NOT KNOWING HIS REEL WAS ENGAGED. CABLE PULLED LOOSE FROM WIRE IT WAS HUNG WITH KNOCKING EE TO GROUND. HE FELL ON HIS RT HAND, INJURING HIS THUMB.