"They leave a far nastier taste in the mouth," she agreed, returning the hand squeeze, squinting at the diagram on which he'd drawn some notes. It amused her that he'd been scared into writing words, disguising the real purpose of the piece of parchment. "He can't do anything," she reminded him. "We're not his pupils. We could walk out of here right now if we so wanted. In fact, I think I might do that. This seems like one big utter waste of time to me." she concluded, thoughtfully as Snape deducted more points from Gryffindor as a boy called Neville Longbottom spilt bile on the teachers shoe.