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In the Avengers movie, when

Bruce Banner is in the flying fortress, he becomes angry and transforms into the Hulk. Black Widow happens to be next to him and even though both are on same team, he attacks her and then Thor. He becomes hostile to everyone on the ship. But later on, in the fight against Chitauri troops, Hulk is very comfortably self-controlled.

Why is that?

The only thing I could think of is that it has been many days (a year?) since the Hulk had gotten angry, so he couldn't control himself.

But that's lame to be so puny when Bruce Banner was compared to Stephen Hawking in smartness.

In the Avengers movie, when

Bruce Banner is on the helicarrier, he becomes angry and transforms into the Hulk. Black Widow happens to be next to him and even though both are on same team, he attacks her and then Thor. He becomes hostile to everyone on the ship. But later on, in the fight against Chitauri troops, Hulk is very comfortably self-controlled.

Why is that?

The only thing I could think of is that it has been many days (a year?) since the Hulk had gotten angry, so he couldn't control himself.

But that's lame to be so puny when Bruce Banner was compared to Stephen Hawking in intelligence.