You were the minion of the Lady Bone Demon. A servant of evil, if you will. Were you controlled? Maybe. Doing it out of free will? Sure. However you were made to do this doesn't matter now. And why doesn't it matter now?
Because your master was now dead.
The Lady Bone Demon had been killed by MK, defeated in the battle. Without your master, what was your purpose now? Did you even have one now? Something began to take place within you. Were you grieving? Were you enraged? Nobody knows.
But you had to get out of here now. They knew that you were the Lady Bone Demon's servant-hell, you directly interfered with their plans and slowed them down a whole lot. What if they killed you, just like they did to the Lady Bone Demon? Escape was the only thing on your mind right now, anything after that could be figured out later.
"There! They're getting away!" A voice shouted, causing you to spin around. It was Mei, pointing at you and revealing your location. "There's the rotten servant... almost got away." Wukong said, narrowing his eyes. He appeared to have not a lot of sympathy-which was reasonable. You almost let the Lady Bone Demon freeze over the entire world. MK, Tang and Pigsy joined the rest of the group, and MK had a bit more of a sympathetic look on his face.