Hulk turned to face the warrior woman and said "I accept." The Hulk took up his sword and charged forward to fight with an eve-increasing rage building like an inferno.
The people of Sakaar had yet to learn the most rudimentary lesson of Hulkology: The madder Hulk gets the stronger he becomes and the more he's hurt the madder he gets which in turn makes him ever harder to defeat.
It was time that all these damn hunters and warriors learned to leave Hulk alone. And if Caiera lied and ordered everyone killed anyway Hulk would carve a path of death and destruction across Sakaar that'd make what he's done on Earth seem like nothing!