EE was removing ventilation curtain in the #5 intersection to move the miner to the #6 heading. The EE could not get the curtain down. He then stepped on the bottom of curtain to gain leverage. The EE did not know there was a pogo stick on the back of the curtain. He pulled the curtain down bringing the pogo stick with it. The stick struck EE in the mouth, miner chipped tooth.