Cluster behaves wrong

[a19dc142]

Hi. I'm trying to add a cluster to face warp, but if I translate the head controller and rotate the cluster controller, it goes wrong...

I think it seems to be rotating along the origin point of the cluster. I want to know how to get cluster moving keep up with head.

If you know better idea, I do not stick to the way of using cluster.

Here is the scene file. Olaf.mb is the original file, and Olaf3 is the one I tried to add cluster not work correctly. 

Thanks

[gautham.chandran47]

What about adding a joint for that head rotation and keeping upper face joints as its child?