Wukong's passive ability not working as intened:

If you kill Wukong, a duplicate of him should die instead, and Wukong should receive Health and Shield.

At the moment this works like this: his duplicate gets Health and Shield, and it cannot be chosen as a target, and because of this the battle cannot be finished. We are aware of this bug, and are fixing it. In the meantime we suggest you to defeat his duplicate first, and then defeat Wukong himself.