My heart jumped. My breathing stopped. I stood there, stock still, unable to believe what I was hearing. It had been true; every thing Gibbs had told me had been true.

When Gibbs had asked me to be there, I had prayed that I would not be required to use my weapon. I prayed these accusations would be found false. I prayed Ari would not be there. I prayed for so many things. Sometimes, though, praying isn't enough.

Deep down, I think I already knew that it had been true, but had simply refused to believe it. I couldn't allow myself to believe it because it would have been too painful. But standing there, hearing those things, I had no choice but to believe it.

Ari had turned on Mossad.

Ari was a double agent.

Ari had killed Agent Todd for no reason other than to cause pain and suffering.

Ari…my half-brother…he was not the man I had thought he was.

So what could I do in the face of this revelation? How could I proceed with my mission? My mission was no longer; even my father had told me that I was to cooperate with NCIS. Now I had a new mission, one that would require from me a greater strength.

I knew what was expected of me. I knew that I could not hesitate. I knew that he was counting on me, that he had put his trust in me the way I could not put my trust in him.

So what did I do?

I pulled the trigger.