EE WAS WALKING ON A HORIZONTAL MANITOWAC BOOM TO PERFORM MAINENENACE DUTIES. HIGHLIFT OPERATORMOVED BOOM CAUSING EE TO LOSE BALANCE & FALL TO THE GROUND. HE HIT LOWER RIGHT BACK & LEGS ALONG WITH HIS CHEST & ELBOWS. MOST OF THE DAMAGE WAS DONE TO THE RIGHT SIDE, THERE ARE NO BROKEN BONES