The ramp agent was functioning as the 'talker' during the push back operation and his headset was plugged into the aircraft at the nose wheel well. The agent realized he had forgotten his lighted hand wands and moved to the wheel well to unplug his headset from the aircraft just as the tug driver started pushing the aircraft back from the gate. The injured agent's foot and ankle were run over and crushed by one of the nose wheel tires.