Rotation of a spefic mesh in an animation

This animation has 5 animation groups
https://playground.babylonjs.com/#AJA5J6#25

I would like to rotate the figure like the dude is doing here:
https://www.babylonjs-playground.com/#RNQVM3#14

I did it with using a hinge-mesh as a parent:

https://playground.babylonjs.com/#AJA5J6#26