First of all. Thank you for pointing this quote out!

Well, I'd say the first thing you do is hide better :) It hardly needed much more than a cloack over the object about to be transfigured. Perhaps another weakness of Harry's, overcomplicating? I appreciate the sacrifice made and the development by the character of Draco. Still, for any good mastermind in the making keeping your top-secret plan top-secret is usually an extremely good idea.