ok first, you need to have dismemberment of 1. other then that its all normal

extend neck (it should break off)
Once it breaks off hold all your joints.

Press space untill it hits him and starts breaking him.
go to uke
press space once more
hold all
right now, his abs and lumbar should be apart, his legs should be split in half and his ankles as well
contract your pecs
press p and watch his glutes.

Weird huh? also a little bullet like thing shoots out and breaks tori.

Nothing happens, you have a bug.

haha

super powered glute shot is the bullet thing u got there. if you dismember something really powerfully, the glute ''shoots'' but usually doesent go fast enough to hit the floor before going back, for example in judo.