The failure drill is more of a dedicated triple; two center of mass and inmediately one to the head. No "assesment".
The Mozambique Drill was added to the modern mechnique of gunfighting by Jeff Cooper based on the experience of one of his students, Mike Rouseau, while on duty in Mozambique. Rouseau was later killed in action in the Rhodesian War.
The Mozambique Drill considers the deficiency of the pistol round of stopping an adversary. Statistics show that reactions in gunfights are extremely irregular -- one must be prepared for the worst. Many times it is the case of after absorbing the trauma of the first shots, the enemy will disregard further ballistic insult. It has been pointed out that simply "more shots" are not the answer. The Mozambique Drill instructs the shooter to place a double-tap in the center of mass, followed by a carefully aimed headshot.