EE STATED THAT HE WAS WORKING ON A HYDRAULIC PROBLEM WITH THE DRILL. HE STEPPED ONTO THE COVER OVER THE DRIVE LINE AND DOWN ONTO THE OTHER SIDE. AS HE DID, HE STEPPED ONTO SOME HYDRAULIC HOSES ON THE DRILL CAUSING HIM TO TWIST HIS LEFT ANKLE. NO LOST TIME INCURRED BUT IS ON RESTRICTED WORK ACTIVITY.