@sieaner
I really dont care what you post, I have the game I know that its all running through the IN GAME ENGINE:
Here is a demonstration:
SPOILERS!!
http://youtube.com/watch?v=rpR2v5TrrqE&feature=related
You see that so called pre rendered scene? You can use the 2nd controller while playing and fight that certain boss with that character.
Also this is not a spoiler:
http://youtube.com/watch?v=EwQsq06F4Ng
Notice 4:00
and 5:20
If this were "pre rendered" you wouldnt be playing in it.