Books tend to react with one another, creating randomised magic with a mind of its own.
Gnomes out of Oz burrowing under the mountains in a world where music creates magic.
Harry Potter is a fictional magician who uses words to create magic.
Again, the formula for creating such magic isn't easily broken down.
Surely he must feel something for her, otherwise they could never create such magic?
Marbury was asked to create magic at the end of the Clippers game.
Kanye West e-mails the media, claims to create magic.
He created such magic for each of us.
It's true that the trio didn't create real magic this time around.
I believe she left because, as you said, the Seidh could not create magic.