Harry stands, his wand tucked into his robes, prepared to meet his death. Voldemort stares at Harry, curious but also hungry to finally be rid of the boy, his last enemy. "Avada Kedavra!" Voldemort screams and Harry collapses, momentarily lit by the green flash of the spell. There is an uproar as the Death Eaters shout in triumph, and Voldemort laughs in glee.
Hanging limply in Hagrid's huge arms, Harry is brought back to the Hogwart's grounds for the last of the resistance to see. Ron and Hermione were among the highest voices heard who screamed in pain at the sight of their fallen friend and last hope.
Faltering in despair, the crowd resisting Voldemort was forced to throw away their wands and line up against the castle walls. But one among them knew that there was one more hope. Before Harry had set out into the forest to meet Voldemort, he had told Neville Longbottom that he would be the one to finish the Dark Lord. With the final horcrux destroyed which resided in Harry, Neville knew that it was all up to him now. He was the one for whom the prophecy was written. His parents had thrice encountered Lord Voldemort, and like Harry, Neville was born in the seventh month, just like the prophecy said. Neville was sure of his purpose.
Neville gazed around at the crowd that was bowing to Voldemort, who reveled in his triumph. The dementors were now descending upon the despairing crowd, who felt no hope and could not resist the dark emptiness which enveloped them.
But Neville alone had hope left. At that moment he heard the shrieking cry of Fawkes the Phoenix. Everyone was oblivious. The Death Eaters and Voldemort were preoccupied by the subordinate and hopeless crowd. But Neville caught the Sorting Hat which Fawkes dropped in his path. Running as he pulled out the sword of Gryffindor from the Hat, Neville broke through the celebrating Death Eaters, hurtling towards his target who was pointing his wand at Luna Lovegood. Voldemort had chosen to kill this betraying witch first because he could sense some form of resistance in her among them all. There would be none of that. The next thing Voldemort saw was a flash of silver as a sword cut off his wand hand. He screamed in surprise and pain and a battered boy retrieved Voldemort's fallen wand and pointed it at him. All of the Death Eaters and people in the crowd looked up in awe at what just happened. Neville, without hesitance and utmost certainty shouted clearly, "Avada Kedavra!" The Dark Lord had finally fallen.