The concept of the Mozambique is sound but the application of the technique is flawed. The concept of engaging alternate target areas based on ineffectiveness or opportunity is a sound technique with many real world accounts to support the concept. The effectiveness of the concept is based upon the application of the technique and the development of the supporting mental processes. That's a real fancy way of saying is all about how you train.
There are two common techniques for initiating a transition to an alternate target area. They are the Hard and Soft transition. The Hard transition is the more commonly known technique whereby the shooter induces an intentional pause while consciously identifying an alternate target area, transitioning to that area and reengaging the threat. As Rob has pointed out earlier, there are several conscious and subconscious processes at work. Some of which are conflicting. A highly trained person can handle this rapid transition between states of consciousness, but I would emphasize "highly trained." The Soft transition removes the conscious act of evaluating the effects of our shots and the decision making process (OODA Loop) from the equation and simply requires a guiding of the weapon to another target area without the need to evaluate, process, decide, re-orient, and re-engage. During a soft transition, there is no pause during the engagement process. After initiating the engagement process and at some point during the engagement, a transition to the alternate target area is initiated regardless of the effectiveness of the initial center mass volley (making an assumption that the threat is still present.) During the Soft transition, the threat will be engaged continuously during the movement of the weapon to the alternate area.
Our ultimate goal is to stop the threat. The best method of doing that is to inflict as much damage as possible in the shortest amount of time. I am a firm believer in that concept that any damage is good damage. The more damage I can inflict, the quicker I will either diminish or eliminate the ability of the threat to effectively damage me. While just about everyone recognizes the effectiveness of the "head shot," very few people consider the vulnerability of the neck/throat area. We train to use the neck as the path to the head. If you follow the neck during a transition it will take you to the head everytime, oh and by the way, keep shooting while your on that path to the head! I don't know any reports of people taking rounds in the neck/throat and continuing to fight for any substantial amount of time.
Regardless of how highly trained you are, the Soft transition technique is faster as it removes just about all conscious thought from the fighting process. Anytime you can shift technique or response from a conscious based response to a stimulus based response you will perform the technique faster and more efficiently. The idea that we don't shift or move the gun during the act of shooting is flawed. Quite the opposite, the gun is always moving. Whether a result of our natural wobble zone (which is dramatically increased during after the adrenaline dump,) the weapon moving during recoil, our movement during the engagement process, or our threats movement during the engagement process. We are continually moving and adjusting the weapon. If we have the ability to make these adjustments, we also have the ability to move the weapon whether it's a conscious or subconscious act.
During the application of the Soft technique, you engage multiple rounds center mass. If the threat is still present or more importantly, if there is still an object in your scope or behind your front sight then you continue to engage the threat while shifting your target area. Just as we imagine stopping a threat with any various number of rounds, we continue to visualize our threat being active during our Soft transition until multiple rounds impact the alternate target area. It's not a different technique, its just an extension of our current technique.
I think the concept for the Mozambique is valid, but the traditional application is flawed. Proper technique, training, and mindset can make this an effective technique in a close quarters situation if applied properly.
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