Becoming the opponent means you should put yourself in an opponent's place and think from the opponent's point of view.

In my school, no consideration is given to anything unreasonable; the heart of the matter is to use the power of the knowledge of martial arts to gain victory any way you can.

There is even rhythm in being empty.

As you get the rhythm you discern how to win.

What is essential is to suddenly make a move totally unexpected by the opponent, pick up on the advantage of fright, and seize the victory right then and there.