Disclaimer: I don't own Merlin.
She had heard the word before. She had made many sacrifices herself. For her friends, long ago, when she had friends. For her family, when she had a family. And for her sister.
When she had a sister.
Only now, alone, with the memory of the coldness of the blade in her hand and warmth of the blood on her fingers did she truly understand what sacrifice meant.
And she hated it.
He thought knew what it meant. He had given up many things for Camelot. His freedom. His love. He had always been willing to give his very life.
Soon, he would do so.
But now, as he watched his unarmed servant leap towards certain death, doing what he could to save his master, his friend, he saw what sacrifice really was.
And it awed him.