The Satrap Ekuman's difficulties with his aged prisoner had only begun when he got the fellow down into the dungeon under the Castle and tried to begin a serious interrogation. The problem was not, as you might have thought from a first look at the old man, that the prisoner was too fragile and feeble, liable to die at the first good twinge of pain. Not at all. It was almost incredible, but actually the exact opposite was true. The old man was actually too tough, his powers still protected him. All through the long night he not only defended himself, but kept trying to hit back.
- From Empire of the East by Fred Saberhagen