Quote Originally Posted by mooyingmantis View Post
Which can compress and injure (herniate) the discs between the cervical vertibrae.
Yeah, this even hurts a lot through a strong helmet.

I always used to think this type of hammer fist (to the top of the head) a pointless technique but then I started using it only when my opponent ducks to evade. It became really useful. However it is so painful to the neck, even with light power, that we had to stop using it. The key is being able to link it suddenly on the end of another punch rather than doing it from a distance, it doesn't need any strength to hurt.