Here is my theory on the fight scene between The Hulk and Iron Man in [The Avengers: Age Of Ultron](movie:293035) movie. Many of us have been waiting to see a fight between Iron Man and the Hulk, and it was teased in the first Avengers movie, but now it looks like we will finally see the fight happen.
Anyone who has read the comics, knows that Iron Man and the Hulk have a tenuous relationship, and that Iron Man/Tony Stark have never really trusted the Hulk, even when he was a member of the Avengers. The Avengers eventually send the Hulk into space, which starts the whole World War Hulk saga.
I think in this Avengers movie, we finally see the fight between Iron Man and the Hulk, but with a twist. I think that Ultron controls one of the Iron Man suits, and the Hulkbuster armor, and he knows that that is the only way to stop the Hulk. It looks like a great fight scene, but i still think that Ultron is controlling one of the Iron Man suits.
At the end of this fight, I think that the Hulk beats the Hulkbuster armor, and still thinks that Tony is in the suit, and he blames Tony for fighting him, and goes on a rampage, and that is what sets up the Hulk being sent into space.