The Bat-Bogey Hex

Ron came into sight, closely followed by Ginny, Neville and Luna. All of them looked a little the worse for wear — there were several long scratches running the length of Ginny's cheek; a large purple lump was swelling above Neville's right eye; Ron's lip was bleeding worse than ever — but all were looking rather pleased with themselves.
"So," said Ron, pushing aside a low-hanging branch and holding out Harry's wand, "had any ideas?"
"How did you get away?" asked Harry in amazement, taking his wand from Ron.
"Couple of Stunners, a Disarming Charm, Neville brought off a really nice little Impediment Jinx," said Ron airily, now handing back Hermione's wand, too. "But Ginny was best, she got Malfoy — Bat Bogey Hex — it was superb, his whole face was covered in the great flapping things. Anyway, we saw you out of the window heading into the Forest and followed. What've you done with Umbridge?"
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Harry Potter and the Order of the Phoenix Chapter Thirty Three: Fight and Flight