You are more powerful than him, but try not to hurt him.

MK had to take his stuff at LBD's palace, and who had to be in guard? Wukong. So now, you're fighting Wukong so MK could enter with Mei and the others.

While fighting, you didn't use your powers for not hurt Wukong, after all. He was still in there, deep down.

You: "snap out of it, Wukong!"

Wukong: "only my master can say WHAT I HAVE TO DO!"

he says, as he tries to punch you in the face but you block it.