Good, bad or neutral ending? Well, I guess in Amann's case it depends on where you end the story...
The Good Ending:
[spoiler]He smiled. Her reflection brought back memories. Some good, some bad, but all in all he accepted his fate. The gun in her hand might as well have been a hammer, the bullet the nail. Destiny had brought him to this place, and as he looked out upon the world of his birth, he knew the stinging, final truth.
The circle had become complete.
"I taught you well. Now, end this. Quickly."[/spoiler]
The Neutral Ending:
[spoiler]She hesitated. Amann saw the confusion, the mix of feelings. "It is okay, my dear. I understand your dilemma. Become the monster, or bring it to justice."
He turned slowly towards her. He saw the fear in her eyes. Smiling, he said, "Do what you feel is right. In the end, that is the only thing that we can do," he took a step forward, "you are not a monster."
Nikilaiki dropped the gun, and fell to her knees. A moment later she began to weep. "Why? Why did you kill him?"
Amann nodded. "I owe you that much. He was a good man, but he was a liability. If I had not killed him, he would have been the death of many, many more of my kin." For a moment, he contemplated walking over and putting a hand on her shoulder.[/spoiler]
The Bad Ending:
[spoiler]"Regardless, I don't think there will be any 'Justice' today, dear."
She barely realizes that there is a gun in his hand before she sees the flash, feels the pain...
"It's the little things, you see. Those
annoyances. You were one of them, and now I can slip away."
He savors the last precious moments of her life. The look of hatred, the shock, and the slowing of her breath. She tries to say something but she is too weak.
Leaning down, he whispered into her ear, "Embrace the Void, my child."[/spoiler]
...sometimes, endings aren't what you expect them to be.
Sometimes there's only one real potential end, because the momentum of what has transpired before makes no other end possible.
Shades of gray FTW.