'It is forbidden to fight on the Killing Ground,' he said, and paused while he considered the sense of this… — Terry Pratchett

'We don't have gods where I come from,' said Twoflower.

He wondered what kind of life it would be, having to keep swimming all the time to stay exactly in the same place. Pretty similar to his own, he decided.

The Watch were always careful not to intervene too soon in any brawl where the odds were not heavily stacked in their favour. The job carried a pension, and attracted a cautious, thoughtful kind of man.