Demon hunter morph effect

Hi, in my newest map Rpg: Rage of Dawn I need to have the morph effect from demon hunters "morph" animation. I have succesfully deleted the geosets and I have the effect I want, but...

the filesize is still near the normal demon hunter mdx filesize (340kb) and I dont think that stupid effect would take so much space, so my questions are:
How do I know which (if it does..) bones that effect uses and how to remove all other bones and helpers so I can really reduce filesize

thx for your help (and please explain like I am a noob, cause I am! )

Edit: I found it out myself (well, a pro helped me :P) no need 2 invest time in this

please releace this model, id like the morph effect in my map.

ok, it has a few things I have not (that means, till now) been able to overcome. 1 is, the lightning is too far of the black stuff, 2, there is a bit of the black rotating around the whole thing. I will try to find the error I made, but it looks good as it is anyway. Here it is: