ETA: There is now a third thread, so send new comments there.
Since the first thread has exceeded 500 comments, it seems time for a new one, with Eliezer's just-posted Chapter 33 & 34 to kick things off.
From previous post:
Spoiler Warning: this thread contains unrot13'd spoilers for Harry Potter and the Methods of Rationality up to the current chapter and for the original Harry Potter series. Please continue to use rot13 for spoilers to other works of fiction, or if you have insider knowledge of future chapters of Harry Potter and the Methods of Rationality.
A suggestion: mention at the top of your comment which chapter you're commenting on, or what chapter you're up to, so that people can understand the context of your comment even after more chapters have been posted. This can also help people avoid reading spoilers for a new chapter before they realize that there is a new chapter.
Good points, but I think that with some practice in teamwork of the sort employed in Neville's "Special Attacks," they could have come up with something. Say, Draco levitating Hermione horizontally out the window, so she can use a Shield Charm to cover herself completely while Draco moves her out of Harry's one-handed firing arc. Throw in a baseball-style hand-signal code between them, so if Harry is concentrating on Hermione, Draco lets her go while she casts Leviosa on herself, and he zaps Harry, or if Harry tries to take aim at Draco, Hermione drops her shield charm and fires. And this assumes that neither of them (or Genius!Harry himself, for that matter) can come up with a better flying spell than Wingardiam Leviosa.
Maybe their problem is that they weren't quite ready for that level of teamwork, though if it was me in either of their places I'd have wanted to look into developing an inventory of "Special Attack" type maneuvers after seeing them work so well for Chaos.
OTOH, the likely real reason is that the Gecko Gloves give Harry a chance to use Science! in a fun way, so the Rule of Cool applies. Still, reactionless flight is such a trivial matter in the Potterverse that I still found myself wondering why they just went out after Harry on his own terms instead of trying to wield air power against him somehow. Maybe a couple lines of dialogue along the lines of "Why don't we use [flight-based attack X]?" "We can't because Harry would just use an Indra's Net Jinx!" (or some other expected counter that makes using the Gecko Gloves then sliding around on the slippery roof their best response to the situation).
Does that work? I know Voldemort can fly but I got the impression that was something a bit more advanced than Winguardium Leviosa. Something off the order of an enhanced continuous form of apparation that requires huge amounts of concentration and skill to maintain. It would come with an advanced understanding of the mechanics of magical transport, along the same lines of Harry's advanced understanding allowing him to partially transfigure objects.
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