Harry went over the international reports at Auror Headquarters, trying to bury himself in work rather than focus on where life had taken him. He knew he hadn't really taken the idea of being an Auror seriously before, seeing as he had been unprepared for the amount of research and paperwork that would be involved.Not to mention the temptation to resort to Dark Magic. I used it too easily when I was angry after Sirius died, and because I hadn't kept my emotions in check, I accidentally killed Neville in the heat of battle.