Using the elbow to complete a cavalier is more unusual than commonplace.
This cavalier is most typically trained in response to a failed attempt to utilize the hands in making a cavalier to strip a knife from an attackers hand. The elbow cavalier is in many respects a last resort, because the completed movement often removes the knife to the floor – creating the potential for an additional threat.
Another safety issue that needs consideration is the elbow travelling towards the knife hand with the potential for severely cutting your forearm as you make the elbow. In the video below, I address these issues and offer an approach that mitigates these risks. Enjoy!