A/N: Yes, this is based off of a dream I had last night. It was rather vivid, so I decided to write a short drabble for it. Let me know what you think...should I add more drabbles to this story?

Disclaimer: If NCIS was mine...well, I wouldn't be sitting here writing FanFiction for it, would I?

It was an accident. He didn't mean for his weapon to fire. It had only been a gut reflex. And now he stood, staring at the young girl's body on the cold cement ground. She couldn't be any older than fifteen, and now she lay motionless in a pool of her own blood, at it was all his fault.

Tony couldn't move. He'd made the mistake of firing off his gun when he thought she'd been the criminal they were searching for. Th chunky Blackberry phone that Tony had mistaken for a weapon was flung a good twenty feet away. This girl had probably only been taking a shortcut home from school. Tony had been so strung up, deprived of sleep and food. He'd been sitting in that stakeout for two hours, so as soon as McGee nervously and quickly pointed out someone walking towards them, Tony didn't hesitate to fire. The girl was in the wrong place at the wrong time. But that didn't change the fact that Tony killed her. He had no excuse. And now the guilt and regret was eating him alive.

When Ziva came up behind him and placed a hand on his shoulder, he nearly jumped out of his skin. He turned around to find her deep chocolate brown eyes boring into his light hazel ones.

"Tony, it was an accident. An honest accident," she said quietly.

He began shaking is head furiously. "A fatal accident," he said, gesturing towards the girl's body.

Her face contorted into a look a pure sadness and understanding. Tony's eyes welled up and a few tears escaped, running down his cheek.

"What is her family gonna think? They're gonna hate me. I did this to their little girl. I took her life. I put a bullet through her chest, based on a stupid assumption," he said, his voice burning with anger and frustration.

"Tony, it is not fair to beat yourself up over this. Nothing can be undone now," Ziva said softly.

"I know, Ziva. But that doesn't mean I wish I could change everything. You don't know how terrible this is for me," Tony muttered.

There was a beat of silence.

"I do know," Ziva said. Tony shot her a confused glance.

"Back when I was with Mossad, I accidentally shot a teenage boy that thought was a wanted assassin. Their similarities were striking," Ziva admitted.

Another beat of silence.

"Ziva, I didn't know," Tony said.

"Easily one of the worst days of my life," Ziva sighed.

Tony summoned up the courage to once more look at the lifeless teenager's body on the ground. Fresh tears blurred his vision. Ziva placed her hand on his shoulder again.

"Tony?" she said.

"Yeah?"

"Please, don't ever feel like you are alone. It breaks my heart," Ziva said. She turned around and walked away, back towards their van.

My heart was broken a long time ago, Ziva, he thought. But of course, he didn't have the guts to say it out loud. Adding to the list of things he regretted that day.