"Wrong point entirely - Its a mother protecting her children. The raw fury of a mother whose children have been harassed and threatened for years, one son maimed and another lost just minutes/hours earlier, and now her lone daughter comes under attack. She loves her children, even her 'adopted' Harry and Hermione, and now someone dares strike at them in front of her. Only a fool would dare to seperate a mother from her children."
Did you not notice that it said "JKR's A:"? JKR= J.K. Rowling, the author of the book. You can find your own meaning from books, sure, but that was the author's intention and you can take it up with her if you think she's wrong :) I don't think you're wrong- because obviously that's a part of it, but the meaning goes beyond the surface.