EE WAS BYSTANDER TO UNIT POWER MOVE. COWORKERS WERE PULLING SLACK MINER CABLE WITH A BATTERY SCOOP. EE WAS GETTING A DRINK AT TOOL SLED. SCOOP OPERATOR WAS NOT SIGNALED TO STOP BEFORE PULLING DOWN THE SLACK CABLE WHICH WAS HUNG OUTBY THE POWER CENTER. WHEN CABLE & WATER LINE WERE PULLED DOWN THEY STRUCK EE IN THE HEAD & KNOCKED HIM TO GROUND. WENT TO HOSPITAL AS PRECAUTION.