Art Ward demonstrating.
Begin in left hanmi with the jo held horizontally (left hand in middle of jo and right hand at the base). Now slide both feet to the right side of the line-of-attack (remain in left hanmi) as you slide your left hand to the front of the jo and "hide" the jo behind you (as in tsuki gedan gaeshi).
Both hands should now be at the forward end of the jo. Release the jo with your left hand. Take a long step forward with your right foot, sweeping the jo in an upwards arc across your opponent's face. Catch the jo with your left hand at the end of the sweep, finishing in a defensive position.
Tips: