This video shows the Rock Shield spell in action. It demonstrates how it can be used to defend yourself and capture opponents.
SPOILER WARNING The first boss of the boss of the game is featured here and some other tidbits as well.
This video is part of DragonEye's on going Let's Play. If you'd like to see it from the beginning check out his post of the first episode in the media section.
There's a bit of a suspenseful end to this video lol.