This one HIT differently, in more ways than one!
Differently, in that I've never seen one of your films where the main character had their body taken control of by what appeared to be - US, the viewers...where we proceeded to force the victim, in this case, Bruno, to rain down punishment on his own body! He punched his own abdomen until literally passing out! I actually began feeling badly for Bruno as the film approached it's ending. Bruno was really going through hell!

So, the other thing I meant by this one "hitting" differently was...it's one thing to be gut punched by someone else, but when punching yourself, you can much better judge just how severely you can deliver the punches. So I believe Bruno was basically trying to go as extreme as possible with the force of his punches! In essence, going to the breaking point of his physical body, delivering all the intensity and impact he could endure in the moment!
And it was a really nice touch, for the one's in control of his body (US) to begin using his other hand to carry out something completely different to his anatomy! 🙄
It was getting real dicey toward the end, and I must give mad props to Bruno for going there! Bravo!!!