They had a very enjoyable lesson. Professor Lupin had brought along a glass box containing a Hinkypunk, a little one-legged creature who seemed as though he was made of wisps of smoke, rather frail and harmless-looking. ‘Lures travellers into bogs,’ said Professor Lupin, as they took notes. ‘You notice the lantern dangling from his hand? Hops ahead – people follow the light – then
