Turn bone with global rotation

[ParaToxic]

Hey there I have a little question.I have an animated character and I want place the cam to the head of the character and rotate it with the mouse.The problem is that the picked bones rotationorigins are not at 0 ( you know what I mean ) , so when I try to rotate it in the X axis it turns diagonal or something like that.

 

Is there a way to rotate it with the correct origins of the camera ? I mean when I make a simple egoshooter camera with mouse input and say RotateEntity(Vec3(mx,my,0)); it turns the camera perfect with the mouse.Now I want the same result, but now I need to turn the Head which local axis aren't at 0,0,0

 

We speak here about Leadwerks 2 functions Thanks