HE & A WITNESS (NWR EMPLOYEE) WERE TAKING IDLERS OUT OF A RACK AND PUTTING THEM ON A TABLE TO REBUILD. A LINK THAT HOLDS THE IDLER CAN TOGETHER BROKE, CAUSING BOTH EMPLOYEES TO FALL BACKWARDS . INJURED TWISTED HIS KNEE AT THE SAME TIME THE HALF OF THE GARLAND HIT THE INSIDE OF THE KNEE HE TWISTED. KNEE IS IMMOBILIZED DUE TO SPRAIN.