Wii: Zack & Wiki help needed.

I’ll spoiler box this, since it deals with the secret treasures after completing the game. It’s specifically about the stage King of the Jungle.

I had to resort to FAQs for some of these but this one has me stumped. Zack is supposed to go out to the right, efter the room with the bats, ring Wiki to get the attention of the big bad, lure him into the cave, go up and around and ring Wiki again to transform the big bad.
Well, I’ve been doing just that, only nothing happens. Zack stands there like a fool and monkey boy does nothing. Edging closer and nothing happens. Even closer and it’s pancake city.
Any advice on how to do this?

Wish I could help, but this is next on my queue.