In 1987 two men assaulted Eric Butler, a 56-year-old British Petroleum executive, in a London subway car, trying to strangle him and smashing his head against the door. No one came to his aid. He later testified, "My air supply was being cut off, my eyes became blurred, and I feared for my life." In desperation he unsheathed an ornamental sword blade in his walking stick and slashed at one of his attackers, stabbing the man in the stomach. The assailants were charged with wounding. Butler was tried and convicted of carrying an offensive weapon.