"Actually, several things were responsible for us being able to bring you back," she explains patiently. "On the one hand, of course, the fact that the curse only grazed you. On the other hand, the protective properties of our combat gear. Your breastplate absorbed most of the magic. And last but not least, the circumstance that Bellatrix buggered up the incantation, as Harry so eloquently put it. She didn't finish it."