One of the developers for Army of Two: The 40th Day had just shown the media an intense firefight against a heavily-armored, flamethrower-wielding, heavy. He never would have beaten this bad-guy if not for the help of his co-op buddy. The two took turns distracting their foe with gunfire to his welding mask, while the other shot him in the back. It was an intense battle, but the duo were victorious thanks to flawless teamwork
Cooperation and teamwork -- this is what the Army of Two games are all about.