My magic was given to me by Norna. I'd never give up something she gave me, no matter what I was offered.

The other magic I'm in possession of is hers too, even if I didn't receive it directly from her. [ it's clear that he really wouldn't want to give that magic up either, but it's not a hard no at least. ] I have no capacity to learn magic on the fly like humans do, so I couldn't trade for your power or anything like that.