The Hidden Blade Assassin's Creed in Depth

http://www.youtube.com/watch?v=87P8hcUgUrg

This short video answers the question "What would happen if you countered a brute weapon with the papal staff?". As you see it doesn't break (duh, because it's made of metal, or because the devs were too lazy to model it into two separate weapons like with the spear and halberd). I didn't show the complete setup, so here are the basics:
Disarm Rodrigo with the heavy weapon special attack. For those of you who don't know there are two ways of obtaining a heavy weapon.
http://www.youtube.com/watch?v=QJowUveU9uA
http://www.youtube.com/watch?v=VD9THqH8V54
Another thing to remember is that you need the guards outside the room to be there (they won't be if you start from the last checkpoint before killing Rodrigo). After disarming Rodrigo place the papal staff and brute weapon on the side of the room near the entrance. You can't be too far away from the target without failing the mission so bring Rodrigo there (I did with taunting). Climb out of the room and engage in combat with the guards. Lead them to the room. Once you're in the room they can't follow you in there so drag one of them there. Disarm him so that he will pick up the heavy weapon and pick up the papal staff. Now counter with the staff and watch as Ezio stabs the guard through with the supposedly broken weapon.