It was to this table that Parvati returned, carrying a book on minor magical pests that they needed for Quirrell's assigned essay, which was due soon. They had been practicing simple jinxes all year (Lavender had even hit Malfoy with one in the corridor while the blond Slytherin was taking aim at Neville, and ducked his rejoinder rather adroitly, to general applause), and were supposed to be writing about the "appropriate" uses of these spells. Since everyone had just been using them to annoy their House rivals, they had been obliged to consult the library on what you were actually supposed to use Jelly-legs and Leg-locker Jinxes for.