How to follow an imported mesh animation using particle emitter in threejs

I am new to three.js, so I am not sure if I know what I am doing but, I have the following issue:

I have imported a .FBX model and another .FBX model animation (walk). So far this works, but I want to replace the mesh by particles (THREE.Points).

The particles are shown, but they do not follow the animation, please check this GIF. How can I make the particles walk as the mesh is doing?

This is the code:

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The small size and dark gray background makes it hard to see what is going on in the animation.
There are three.js examples of objects being replaced by particles, if that helps.