I thought, in Nature, the defeated animal just rolls on its back in submission...

I thought, in Nature, the defeated animal just rolls on its back in submission and that's the end of it,' said Vimes, as they clattered after the disappearing swamp dragon.
'Wouldn't work with dragons,' said Lady Ramkin. 'Some daft creature rolls on its back, you disembowel it. That's how they look at it. Almost human, really.