Disclaimer: I don't own Harry Potter, the characters thereof, or any of the equipment used in this story and make no money from them.
The Cost of A Bullet
By J.T. Magnus, "Turbo"
'Kill one to save a thousand', crossed through his mind as he leveled the three-hundred meter bar of his scope on the prominent nose of his target, 'No more manipulations, no more Blood Wars, no more orphans... it ends here, now, before it can begin again.'
He had seen firsthand how everything that had gone wrong in magical Britain in the last fifty years could be traced back to this man, acting outside his remit, recognizing no authority but his own... something that the man behind the gun had become familiar with since discovering that the so-called authorities were themselves the true enemies, playing one side against the other; a privilege granted here, a innate right denied there and everyone became so busy blaming each other that no one paid them any attention. Too many good men and women had died so that this man's ego could be satisfied with titles and power...
Too many lives had been ruined, his own included.
There were a lot of ways that 'the power the Dark Lord knows not' could be defined; love, true love... the willingness to sacrifice oneself for a friend, a cause, a loved one... self-sacrifice itself...
Or an Iver Johnson model 5100 .50 caliber sniper rifle with a Leupold Ultra scope, what some non-Magical military personnel called the 'Big Fifty' and others simply titled 'The Hand of God'.
When your powerbase is magical in nature, you pay little attention to technological advances in the 'mundane' world, part of the reason that it ended up in the situation in was in.
Both primary and secondary targets were lined up, the bullet had been conjured so that it would simply fade away without a trace leaving the wizarding world looking for a spell that never happened or existed. Knowing your enemies, having been taught by them turned out to be an asset when you had to kill them, you knew how they thought. His enemies tonight, the reason he was here in a time and place he shouldn't exist, thought that blood and magic gave them the right to control the lives of others.
He had learned a different lesson from them, though, especially from the primary target... He had learned that the only way to have any control was to take it for yourself, that the only destiny anyone really had was death...
Right now, control was two-tenths of a pound of pressure applied to a trigger set to release at a quarter-pound and death waited in the chamber.
"May the world to come be better than the one that was," The sniper prayed in a whisper, applying the last of the force to the trigger and feeling the 'Hand of God' reach out and find Albus Dumbledore and Gellart Grindlewald wanting.
Author's Notes/Explanation: This drabble evolved from a thought about 'what if Harry decided that everything could be traced back to the actions and inactions of Dumbledore and that meant that so those that had died because of them could live, Albus Dumbledore had to die before he came to power'.
Since he became the 'Great Man, Dumbledore' after defeating Grindlewald, the opportune time to eliminate both Dark Lord and save the first victim - Ariana Dumbledore - would be during the time Dumbledore and Grindlewald were friends and could be eliminated at the same time.
The reasons for Harry's decision are semi-deliberately left up to the reader who can imagine this as the beginning of a story, middle of the story or end of the story that begins the next great story... All of which I leave up to anyone who wants to try their hand at it to write, just let me know so that I can read it.