Nero poisoned a suspicious, paranoid rival not by putting poison in his food, because each dish was tested by an attendant. Instead, he arranged for the man to be served a harmless but very hot bowl of soup. It was in the cold water, requested and poured in by the man himself, that deadly poison was delivered. Without this suppressive cover, the countermove is too obvious: when you know where the enemy is going, you go there and block them.
