He is standing at the edge of a cliff.
The cliff holds no significance for him; indeed, the location means nothing to him. Not the cliff, nor the ground below it, nor the tiny village that can be seen from where he's standing. This is the end, of course. The end of the hate that had run his life.
Too bad it's also the end of him. He could tell them. Almost did, too. He had even written something, a requiem of sorts. He could have given them the requiem and provided closure, because they'd never again see him. But to simply give them a badly written poem-he never was good with poetry, never saw any use for it-would insult their intelligence. They would know, sooner or later. They would know because they would search and look and interrogate until they knew the whole awful truth. They would not be satisfied and they would deny it but they would have to move on because it would be-is-the only thing they could-can-do.
With his mind empty, he falls, becoming one with the world and then becoming nothing with oblivion.
Hey, look! I finished something! EVERYONE RUN FOR YOUR LIVES, IT'S THE END OF THE WORLD-!
Anyway, that's that, short as it is. If Sasuke doesn't die in the end, there will be problems. Sasuke living would be so out of character it would be I don't even. (I haven't been reading, can you tell? But I'm sure it doesn't matter, the fans are so lazy they can't contemplate actually reading-oops. Please don't kill me. But really, guys, read the goddamned manga, don't just watch the anime. Full of harmful fillers, like processed food, it is.)