General questions and discussions.

I noticed that when summoning the spellbook in battle and closing it, the book flashes twice (it closes once, then closes again). However, the spell is only cast once. I have the "Double Spells" ability in "The Shadow of Death," and it behaves the same way here (the book closes twice). So, it seems like the spell is being cast twice somewhere in the process. Which version was this based on?