"I've told you the end result," he elaborates, "and you know several steps in the preparation. Try to deduce the rest. It's of no moment if your predictions aren't realized, as long as you can justify them and show your understanding of the processes actually used."
"Ah," he says, enlightened. "You haven't. I didn't realize your motives in asking were purely Ravenclaw. However, with your anthropological background, I suspect that you are in fact, familiar with such destruction--or perhaps I should say purification--at least on a theoretical level."