They ran down the next staircase and found themselves in a corridor full of duelers. The portraits on either side of the fighters were crammed with figures screaming advice and encouragement, while Death Eaters, both masked and unmasked, dueled students and teachers. Dean had won himself a wand, for he was face-to-face with Dolohov, Parvati with Travers. Harry, Ron, and Hermione raised their wands at once, ready to strike, but the duelers were weaving and darting around so much that there was a strong likelihood of hurting one of their own side if they cast curses. Even as they stood braced, looking for the opportunity to act, there came a great “Wheeeeeeeeeeee!” and, looking up, Harry saw Peeves zooming over them, dropping Snargaluff pods down onto the Death Eaters, whose heads were suddenly engulfed in wriggling green tubers like fat worms.

Harry Potter and the Deathly Hallows – J.K. Rowling