Brooms are illegal magical artifacts, Wingardium Leviosa presumably too impractical because because it offers neither sufficient mobility to dodge nor allows for using cover so extended use (as opposed to using it just to pass obstacles) would make the levitated person an easy target (Harry can still cast with one hand while hanging on with the other and his feet), and would soon exhaust the levitating person as well. Besides they would be giving up their two to one advantage.
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, Hermio...
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: