EE WAS GOING DOWN STEPS AND HEARD AN AIR VALVE OPEN. HE LOST CONCENTRATION WHEN HE LOOKED BACK AND MISSED THE LAST TWO STEPS. WHEN HIS RIGHT FOOT CAME DOWN ON THE LANDING HIS RIGHT KNEE HYPER EXTENDED. HE FELL AND BUMPED HIS RIGHT KNEE AGAINST THE WALL. KNEE WAS BRUISED AND HYPER EXTENDED.