Derrickman planning to change the seals on the hanger assembly requested the forklift operator to lift one end of the assembly to put the seals through. After having it completed, the forklift operator started performing a reverse maneuver to leave the worksite area and while doing that he tapped the other side of the assembly with the forklift’s rear tire that resulted in one of the stands falling onto the ground together with the assembly and striking the employee on the right foot