Its Hermione

"Oh, what do you want mudblood" Draco snarls. Making sure the book was behind him.

"You would think you would learn some manners after Harry saved you" she said in a huff and turns away from Draco.

Draco didn't like being reminded about that. He might have regreted his Death Eater days but he wasn't completely changed. Pulling the book out he plopped it down at the table. The booked opened to a page and draco looked down and smiled. Well that spell would be just perfect for that little know it all.