The type of games EPIC make don't use interactive storytelling.That's what I'm kind of worried about. There's really no one who can "teach" interactive storytelling that effectively. It's a book that's still being written. How do you work character motivations into gameplay?
In fact, nearly all major blockbuster titles don't.
So like I said, if they insist on telling stories in games like they're films, at least learn from experienced filmmakers.