Harry had just walked through the portrait hole of the staff room when he heard Neville say something to himself quietly. He chuckled, "You know, some say it's time to be concerned when you start talking to yourself. I've always worried more when I started hearing answers, though," he joked, alluding to his time as a student, hearing voices in the school.
He sidled up to Neville's table and indicated the pile of papers, "Essays?" Harry was focusing more on studying at the moment, with his students set to sit their exams in two weeks.