The scream was the more terrible because he had never expected or dreamed that Professor McGonagall could make such a sound. He heard another woman nearby laughing, and knew that Bellatrix gloried in McGonagall’s despair. He squinted again for a single second and saw the open doorway filling with people, as the survivors of the battle came out onto the front steps to face their vanquishers and see the truth of Harry’s death for themselves. He saw Voldemort standing a little in front of him, stroking Nagini’s head with a single white finger. He closed his eyes again.
Ron’s, Hermione’s, and Ginny’s voices were worse than McGonagall’s; Harry wanted nothing more than to call back, yet he made himself lie silent, and their cries acted like a trigger; the crowd of survivors took up the cause, screaming and yelling abuse at the Death Eaters.
Harry Potter and the Deathly Hallows – J.K. Rowling