In Character Chapter 3
Harry Potter was dead. So were Granger, all the Weasleys, McGonagall, Lupin, Moody and Albus Dumbledore. As far as Severus knew, he was the only surviving member of the Order of the Phoenix (though he did sometimes suspect that Hagrid had survived somewhere as well).
Harry Potter was the first to go, and the memory of what happened made Severus' blood boil in a rage that only a Potter could induce. Harry Potter…the selfish, mindless, thoughtless, stupid fucking bastard. Severus hated Harry for what he did more than anyone Severus had every hated anyone else, including Severus' abusive father and Voldemort. Because, when he was sixteen, a couple of months after Sirius Black had died, Harry Potter, the Boy Who Lived, slit his wrists and killed himself.
His note claimed that now that he was dead, no one else would have to die because of his mistakes or trying to protect him.
Thinking of these words, Severus finally lost control and hurled the glass he was holding across the room, smiling grimly as it shattered.
There was a depressed hopelessness in the Order after Harry committed suicide. Though not many of them knew about the prophecy, they all had unconsciously looked to Harry to be the hero. Dumbledore put on a brave face with the others, but alone with Severus, Minerva, or Hagrid he looked lost and weak. To say the least, after Harry died, all was lost.
The Order tried to fight on, but they were killed off one by one, and Voldemort slowly became more and more powerful until the fateful day, almost two years later, when Voldemort stormed Hogwarts. By that time almost everyone was dead: Minerva, Poppy, Filch, Lupin, Potter, Tonks, Molly, Arthur. Practically the only people still alive were the students, who battled desperately against Voldemort, but never had a chance. Hagrid had provided a brief rally, showing up leading an army of thestrals, Centaurs, giant spiders, and an actual giant, but in the end even they were pushed back.
Students, staff, creatures, and Death Eaters fought and died outside the castle that day, but deep inside Hogwarts, in Albus Dumbledore's office, the real future of the wizarding world was being decided by two men.