Regulus sniggerd when Remus told him about the essay. "I must say that it would be a nice solution, although I'd rather build a fence around the dark wizards and keep them imprisoned until we can kill them."
He looked over Remus' shoulder. "I'd be interested to know what the Slytherins of today think." He looked at the other man. "I never did understand the use of the Defence part, especially because it's hard to defend against what you don't understand. Durmstrang never had such restrictions. I wonder if they have changed things."