A crane operator hoisted a load, placed it, and lowered it. Two riggers unhooked the rigging, put the empty hooks beside the load, and signaled the operator to hoist the empty hooks. When the operator hoisted the hooks, one hook got hooked onto the load, shifting it and creating a pinch point where the injured employee's leg was positioned. The employee sustained a scrape to the backside of the right calf and a cut on the lower left leg.