I have read all the books. That's why I was asking. I didn't remember that scene and it seemed out of order to me. But I went back and re-read a couple of wiki posts and it looks like it happens. I hadn't thought of it as happening on that scale, however.
I like the idea that the magic in GOT usually sucks and has horrible, taxing consequences on the people that try to use it. It's a lot better than the whole "wave a staff and my enemies are vanquished" stuff you so often see.