[ She can't help but glance over at the arm, noting with relief that the bite really does seem gone. Not that it's much of a surprise.. It's true that Mami is really strong. Really good at what she does. There's never been a doubt about that in Madoka's mind. ]

Right.. That's part of her magic, since she's a magical girl. I don't know if she used it when she healed you, but she has this gem.. [ Madoka holds her hands a very small distance from each other. Apparently the gem isn't all that big. ] It's called a Soul Gem. It's the source of her magic. And every time she uses magic, it gets a little darker.