Ultratwinkie said:
Oh great, the "but-but she could die" excuse. As if she could fall apart at any moment.
She would have had to be hit pretty hard. The force needed would have to be hard enough to be at LEAST as powerful as a professional fighter's punch to even have a chance. A hit that big would need a more buff person than a mere bus driver.
Not only that, but she would had to be hit in the temporal lobes extremely hard. It takes about 50 g's of force, the strength of a professional fighter. Football players deal with 200 g's of force. Race car drivers deal with 80 g's without injury. Even professional fighters need years of fights for brain damage.
The human body isn't made of glass, if we couldn't take punishment natural selection would have killed us off long ago. It just seems you are grasping at straws now.
Unless he is Zangrief, the chance of her dying is minimal.
There is no need to try to complicate the issue with g-forces and all that jazz. The thing is you don't actually have to be a professional fighter to kill someone with a punch. You don't also have to hit that hard to kill someone, since they can sustain the fatal injuries from hitting their head on the ground.
http://www.theglobalmail.org/feature/one-punch-can-change-your-life-and-hundreds-of-others/309/
http://www.cbsnews.com/8301-504083_162-20078523-504083.html
http://www.thisisnottingham.co.uk/Parents-anguish-cricket-fan-son-killed-punch-head/story-13721662-detail/story.html
The risk always exists. It's especially dangerous when you hit someone who is not expecting it and the girl clearly didn't think he would punch her. I don't get why you feel the need to argue about this.