just cut him what ever way you want

tir ropes around so tight that it will cut the body parts by itself. may take a few tries

sometimes if u cut one part of the body with the chainsaw then the other parts might also get some cuts on them (bringing blood)

try to spike him in his joy or at the very top of the head

try hanging it up side down, or painting it black so u can not so the cut parts.

Now this is even mentioned in the game that click the nails or the metal sticks to return them

stick the ropes on all sides and then cut the body parts

if you want to get to hand quickly click and hol x

use the hand to rip him around a bit and rip his limbs off :D

If you want a quick kill use the AK-47 and shoot his head