Something I came up with, not sure how it went, but I'll leave it up to you all to decide. Enjoy.
Rated T for mentions of violence.
Friendly Fire
Natasha Romanoff was very conservative when it came to making friends and as a consequence very few could call themselves as such. But friendly fire on the other hand was something that she was quite familiar with.
The first time was a coincidence really, out of everyone in the room it was she who was the closest to Banner when the explosion hit the carrier and it was she who was thrown from the room with him. It was unsurprising when Banner lost control and the Hulk came out.
The second time was in extraordinary circumstances and soon after the Hulk, when she went after Barton.
The third time she figured she was having a bad run. The fourth and fifth made her think that she was cursed and sixth she did not expect at all. Because whenever one member of the Avengers turned against the team, it somehow always ended up being Natasha in the line of fire.