Two steel plates (5 feet by 10 feet by 3/16 inch) had been rigged using a shackle, sling, and tagline, then positioned vertically at the ground level by a crane. An employee detached the rigging from the crane hook and two employees were stabilizing the load as it lowered to a 45-degree angle. As the plates were being lowered, they shifted and caught the left foot of one of the two employees against stacked plates. The employee's left tibia and fibula were broken.