CONTRACTOR EE WAS WALKING DOWN A SET OF METAL STAIR STEPS AND HE THOUGHT THAT HE WAS AT THE BOTTOM OF THE STAIRS WHEN HE MISSED THE LAST STEP. HE LOST HIS BALANCE AS HE STEPPED FORWARD TO REGA IN HIS BALANCE. AS HE STEPPED FORWARD TO REGAIN HIS BALANCE HIS LEFT LEG/ANKLE SWUNG BACKWARD STRIKING THE LEADING EDGE OF A STEP. CONTRACTOR SUSTAINED A LACERATION ON THE BACK OF HIS ANKLE J