EE walked out of the elevator and down the stairs to move the hose on the hose tamer 12/31/14. He reached down and moved the hose tamer and when he backed up to see if the hose was spraying in the right direction he stepped on a rock and twisted his (R) ankle. EE did not report incident until 1/2/2015 when ankle 'stayed' swollen. Fractured right ankle.