EE WAS ROOF BOLTING AT THE TIME OF THIS INCIDENT. HE HAD INSTALLED HIS RIB PIN & WAS GETTING READY TO INSTALL CENTER PIN. HE GRABBED HIS STEEL OFF OF THE OPERATORS TRAY, FAST FED HIS DRILL POT DOWN & THE POT OR THE ARM CAUGHT THE END OF HIS STEEL CAUSING THE STEEL TO BE DROVE INTO THE TOP OF HIS FOOT.