"In my experience, it's somewhere in between those two extremes," Severus answered, shrugging. "Some people couldn't be arsed to know where any common room is except their own, and others commit every detail of the castle's layout to memory. Seeing as I'm a prefect, I would belong in the latter category. I can't count the number of times I've had to point a lost first year in the right direction, and here we are, scarcely into the second term." He frowned slightly, looking from Miss Ashford to Newcastle and back again. "Though I suppose technically, the two of you are rather like first years, as well -- at least in that regard."