Yup I hear you Ledkr, and I'm so sorry that happened to you. 
My neck has been so severely damaged by just one blow that I'm still severely effected four years later.
Like it or not, gender makes a difference ... Though I think the myths should steer clear of that minefield.
STBXH 'lashed out' in the moment in the middle of an argument, 'just one push' and 'he didn't even know he did it', obviously he 'can't be blamed for it, it was instinct', oh and the best one, it's not his fault if I got hurt as he wasn't aiming at my neck/ didn't mean to hit hard/ in fact didn't hit me that hard, I was making it up, and no one else would have got hurt from just one hit.
His 'just one punch' on the front of my neck
- threw me across the room (from a sitting position, quite hard to do I'd say)
- hit the back of my head on the wall that halted my progress flying across the room
- the force of the back of my head hitting the wall caused me to lose consciousness (then vomit after I think?)
- ripped muscles and soft tissue at the bit that joins neck to skull, like whiplash in a car accident
- caused permanent damage of vertebrae and facet joints
- plus disc damage and a trapped nerve too
And I was just worried about the bruise as my cover up stick didn't match my neck colour. Ffs!
That's what happens when someone much stronger and much more violent 'just hits out one time'... I don't think my thump would cause the same damage do you?
In fact I think I may have done a two handed push away at some point after that 'first hit', though it's all a little blurry. But I do know I didn't make even a hand print / red mark at the time, let alone a bruise after, (he went topless a lot), and not so much with the internal damage he caused... I was utterly inept and useless at stopping him and thank God he stopped of his own choice. I had run towards my baby's bedroom door, instinct to stand in between him and the door.
He had taken the phone and was sneering at me for trying to call the police, saying he would call the police on me, and I was begging him to, please call them, then tried to move towards me and the bedroom door.