Hermione had witnessed McLaggen’s anger issues first-hand when she’d deducted points for being out past curfew. Hermione knew he would be a terrible teammate and was horrified to notice as he managed to save four penalties. Hermione knew in that instance that he would be chosen as Keeper as he went for the fifth. Quickly making sure no one around her was noticing, she lifted her wand, quietly cast confundo and watched as the ball went left and he went right. 