I am not sure of the scene, since I have writer's block. So please be easy.

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Before him there was a violent battle, behind him was a wall of fire, on both sides of him there seemed to run rivers of blood. His sharp eyes picked out who was fighting who and his blood ran cold. His own people were fighting against Men, the men of Gondor. Many lay dead, both men and elves and it sickened him. Suddenly he found two familiar faces battling within the midst of this chaos.

"Father? Aragorn?" he whispered as he watched as they fought each other.

He could sense the hate in them both for the other, and it felt like a dagger within him. Stepping forward, he tried to reach them. The war went on around him, but he could not touch it, nor help in any way.

Suddenly Aragorn produced a second blade from his cloak. With a force and speed taught to him by Elrond, he stabbed it into Thrainduil's chest. The Elf King gasped sharply and pulled away.

"NOOOooo!" Legolas screamed, agony pulling at his heart.

*It isn't true. This is only an illusion to drive me mad,* he thought to himself.

No one heard his call though. Thrainduil fell, and looked up as Aragorn sneered down at him.

"So much for the high elves. Say hello to your son, Thrainduil," Aragorn growled then slashed through the Elf's neck.

The scene faded away and another took its place. Lothlorien was ablaze before him, and death filled the place. But not the death of elves, but of men and dwarfs, and other creatures was what he sensed. The elves had left this place long ago. It cut him again to feel and see this before him. It made him ill to think that this might happen, but he shoved it from his mind. If it was to be, let it be.

It faded into shadow.

"You always were weak, Legolas," a voice whispered in his mind.

"How am I weak?" he asked.

"You will not save your world, the world that you were born and raised in. The world that at one time you would have shed your blood for," the voice said.

"I would still gladly protect my world. But even I cannot save it from its fate," Legolas said calmly.

"Then why do you want to abandon it?" the voice asked.

"I am not abandoning it," Legolas said.
"The sea grows on your mind as the days pass. Do not deny that!" the voice snapped.

"I do not," Legolas said.

"Weak, foolish elf. You say you are of the light, you say you would protect, but you cower in the corner and let others handle it. You have let your friend fall before it, but he is strong enough. Do you have no heart, elf? I can see within you and all you are is lies and darkness. Turn and face me, for I shall show you what is what you really are!" the voice ordered.
Legolas tried to resist, but found that he must face this creature. He turned and with something beyond all evil. He cried out in fear as his mind shattered underneath the knowledge of what was before him.

*~*~*~*~*~*~*~*~*
Legolas's hand fell away from the sphere and he fell to his knees, where he curled up. He whimpered and shuddered from where he lay. Frodo looked down at him, guilt in his eyes, though his face was cold and impassive.

"You had to see it, Legolas," Frodo said softly, "I will let you think of your answer."

Two orcs came in.

"Take him back to his cell. If you dare hurt him more, I shall personally take your heads," Frodo growled.

The orcs nodded and lifted Legolas by his arms. They then hauled the shocked elf away.