Snape nodded. It was the prudent thing to do; by the look of it, the box would take rather longer than the further half-hour he was willing to spend in the company of students. Nott was admittedly less offensive than most of them (if rather jumpy), but solitude was almost always preferable.
"If you need any more, come back tomorrow. And do tell me if you find anything - interesting." He was loath to encourage anyone to saddle him with boring anecdotes, but he did like to keep a finger on the pulse of any student misbehavior (almost surely implicated in anonymous mail), and it was hard to imagine the boy coming up to him to deliver unimportant news. If only they were all so agreeably quiet.