A brief repreive was given from the Battle of the Death Chamber. One of the members of the Order of the Phoenix - Sirius Black, whom you hadn't known was a member oddly enough, had just been killed by Bellatrix LeStrange and Harry Potter wasn't happy about it... your understanding is foggy about that.

But you could hear the not so dulcit tones of Voldemort echoing from the distance. And Harry, with Bellatrix LeStrange - a veritable slaughterer, has knocked her over with a slightly pathetic killing curse. Dumbledore looks on pensive.

"You need to mean it, Potter. Righteous anger won't hurt me for long. Let demonstrate."