Harry walked among his students in the Room of Requirement, stopping every so often to correct someone's wand work. The lessons had started almost three months prior and since, the D.A. had become a formidable opponent. Neville had took charge when Harry, Ron, and Hermione had left on some paper trail they thought would lead them closer to the Dark Lord, but it always ended in a false positive.
As the last lesson of the semester wound to a close, Harry moved to the front of the class to tell them what he had been keeping a secret.
"It's been so much fun being able to learn and teach alongside you all, but I am afraid this is the last D.A. meeting I will be teaching. Everyone started talking at once. Red sparks flew from Harry's wand, and everyone quieted down again. "I know it not what you all want; it's not what I want truthfully, but I can't stay here anymore, Hogwarts, I mean. I've tried to keep it secret, but the time for secrecy has passed. I think I've found a way to kill Voldemort." Harry didn't get to finish the Dark Lord's name before the entire room erupted in a roar of questions that refused to be silenced even by Harry's profuse sparks.
Finally, Hermione shot a loud boom out of the tip of her wand, the sound reverberating around the magic room. Everyone looked back at her expectantly, but she just kept looking at Harry waiting for him to start talking again.
"Thank you, Hermione. Now I know that you all have a lot of questions, and I want to answer them, but even if I could, I don't think it's a smart idea. The three of us," Harry said, gesturing to Ron and Hermione, "have been looking for a way to thwart Voldemort for this entire semester, but we hadn't been able to find anything out in the meager supply of Dark Arts books in the Hogwarts library. So, we decided we'd have to look somewhere else which is where we've been going the times we weren't at the D.A. meetings.
"In this place, we found a very thick and dusty book. Its author wrote about a way to manipulate the energies of the world to augment the power of our spells. Previously, we'd been bound to how strong our magical cores were, something we couldn't really change, but now, we have the power to be stronger than Voldemort, Dumbledore even. All we have to do is go learn."
At this point, Cho raised her hand in the lapse of talking amid the stunned audience. "Can't we come? We've learned so much from you these past few months. There's no way Voldemort could stop us all if you led us into battle. We'd be unstoppab—" Cho said before being cut off by Harry.
"No, you all can't come. I wanted you all to come for so long, but after thinking it through, I've decided that it's too dangerous. There's a good chance that the three of us won't even make it back, and I can't have your all's blood on my hands. I just don't want anyone else to die," Harry said, stopping before his voice cracked. A lone tear glistened as it slid down his cheek.
The moment lasted for what seemed like minutes before Ron thought better than to showcase his best friend's emotions to everyone. "All right, all right. Let's all get out of here before Filch sniffs us out." Harry still stood in front of everyone as they milled about in stunned silence, too overwhelmed at the actual opportunity of winning the war. Eventually the crowd started to trickle through the door with hushed whispers of what Harry meant in harnessing power.
At last, the room was empty except for Harry and his two friends. He looked at them expectantly, but they said nothing. He saw the fear in their eyes and felt his own, but was not about to play coy. "So, are we ready to go?"