The older samurai stood as if transfixed, his katana still in its saya in his left hand. Then, with a move almost too quick to follow, he transferred the saya to his right hand as he stepped to the left and thrust the butt end of the saya - the kojite - between the charging samurai's legs. The attacking samurai came to a sudden tumbling halt, his sword scattering in the street before him.
The crowd stood in stunned silence as he lay in the street, panting. All eyes were on the older samurai - who sighed, shook his head once, transferred the katana in its saya back to his left hand, then continued on his way.
Application: Even the most innocuous item, used by one who knows, is potent.