In the late 60's, Takamatsu Sensei wrote a series of articles in the Japan Times. All of these articles spoke of Ninjutsu, and the other Budo/Bujutsu. In one of the articles, Takamatsu wrote that when fighting in true martial arts, you must most of all be prepared to kill your attacker, or to kill the person you are attacking.
In response to this, a very high ranking Japanese Karate teacher went on Japanese television and said that what Takamatsu had written was wrong, that those days were long gone and no longer existed, nor did they need to exist any more in this present age. He also stated that he thought Takamatsu was an 'old has-been', being over 80 years old, and long past it.
Takamatsu Sensei stated in another interview that he was far from 'past it', and saw the Karate teacher's comments as a challenge that he wished to accept. He gave the Karate teacher three days to publicly retract his statements. If not, Takamatsu Sensei intended to fight him and kill him, with his hands tied behind his back.
Three days later, the statement made by the Karate teacher was retracted.