User blog comment:IlyPsyx013/FAIRYTAIL CHAPTER 477/@comment-7418318-20160314134250/@comment-7418318-20160314135956

If her plan was to send him flying, the best way to acomplish that is to hit close to the center of mass, not the neck.

Hitting the neck should either break his neck, or make him fall over and land on the floor right in front of her, especially considering she came from a slightly higher angle... I guess in hindsight, Mashima really doesn't get along well with physics. ^^