EE was pulling up to 223 miner when miner started backing up. His shuttle car got stuck on the bumper of the miner. He started flagging miner operator when miner started to pull forward dislodging the bumpers, letting the s/c drop to the ground throwing EE up into the canopy knocking his mine hat off. His head then jerked backwards into a bolt/nut lacerating the back of his head.