This takes place when Bruce is still hiding out, before Black Widow recruits him for the Avengers Initiative.
...
Chapter Thirty Three
Bruce had spent several months alone, hiding out. He was a doctor, helping out the sick, while trying to control his anger.
"Have you succeeded in controlling your anger?" a voice asked.
He turned and saw a young girl of fifteen.
"Who are you?" Bruce asked. After all, when you were in a situation like his, you had to be cautious.
"A friend," she said.
"Is that code for S.H.I.E.L.D.?" Bruce asked, giving a harsh little laugh.
"No, that's code for someone who knows way too much about people she should have never heard about."
"What's that mean?" Bruce asked. "What, you're a kid of a S.H.I.E.L.D. agent and you decided to break into their files or something?"
She gave a bit of a harsh laugh. "Something like that."
"Anyway…." She continued. "Here's a tip – learn how to change on command." She got up from the floor and walked to the door.
"What do you mean?" he asked.
"You can control your anger if you can control when the Hulk comes out. If you can change between Hulk and man at will, you can control your anger. It goes both ways, Bruce."
She walked out the door.
"Wait," Bruce said, chasing after her.
But when he looked outside, there was no one to be seen.