"Okay now I want you to put your wands back to where you usually keep them. Once you have done that wait for me to say 'draw' and then I want you to take the wands back out again. But I want you to imagine that you are facing a dangerous opponent, so you need to be fast." he turned back to the class.

"I want all of you to observe exactly where they put their wands and their drawing techniques and decide for yourselves which one is better."