I just finished Mithralis and got the beast form. In the city, near the top, I found a blue crystal next to a stream of water I couldn't pass, which I couldn't find a way to use. Then I found that I could shoot blue bolts for a short while, although I didn't manage to repeat what I had done. Any explanation? How does this work? It might be a good idea for someone to type up an explanation about each form...