If you havent seen dont read the spoilers
Towards the end when bruce showed up with a motorcyicle he was not the hulk then when cpt america startin everyone wut to do he told the bruce to get angry and bruce is like dont worry im always angry well wut i dont understand is how did bruce had the hulk under control i mean he even saved iron man when he fell from the sky and he didnt go under control and attacked his teamates and what doesnt make since is when they first showed the hulk he attack thor and was after black widow but towards the end he didnt lay a finger on her thats what i dont understand that how was he under control