To fight effectively, you cannot be off-balance, you must be upright and stable. Conversely, to cancel the opponent, one main tactic is to get him off-balance, not upright, make his body crooked and bent. In Kenpo, this is known as Angle of Disturbance; it is “getting” the opponent where he has no Bracing Angle. You disturb his balance but retain your own. Other systems refer to Triangulations and Center of Mass. At any rate, there is a place on your opponent where his balance is easily disturbed and there are ways to put him off-balance.
Here we will examine some Kenpo techniques in which Angle of Disturbance is used against the opponent. (It should be noted that the Angles of Disturbance that occur in these techniques also cause Angle of Cancellation, meaning that the opponent is angled so that he cannot use his weapons.)
In the technique Fallen Falcon, the first move involves disrupting the opponent’s base, so cancelling his weapons, and creating this Angle of Disturbance. He grabs your left shoulder, from the front, with his right hand; you immediately step in towards his right, and behind him, simultaneously pinning his right hand to you, and hitting his right shoulder with your right arm–putting him off-balance and leaning back and to his right. You take advantage of the position and throw him.
In Dominating Circles, on the second move you off-balance your opponent using Angle of Disturbance; you get your right foot behind him and strike him high. Observe.
As you can see, in this technique, creating an Angle of Disturbance allows you to use follow up moves that throw your opponent to the ground and furthermore allows follow up strikes. Ultimately, you want to entirely take away your opponent’s base, put him on the ground and control him until you are safe.
In Cross of Destruction, you escape a choke and pull on the opponent’s arm to open up his centerline and cancel him; you kick out his leg to unbalance him and create disturbance to his posture and then disturb his position further by “striking” into a lock on his elbow using his own arm; this leaves him vulnerable to an elbow strike which puts him on the ground because he’s already off-balance and his body is positioned at an angle that makes it possible to “strike” him down.
You finish the technique with an outward elbow angled out and down to put the opponent down onto the ground.
In Grip of Death and Escape from Death, after the initial strikes in the techniques, you grab the opponent by the hair, eyes, nose, philtrum or chin and crank his head back, which puts him in a compromising position and disturbs his base and makes it difficult for him to maintain the headlock hold on you. This move essentially creates Angle of Disturbance and if done correctly, the follow up strike will put him on the ground. Here in my shortened version of Escape from Death, you get the idea of disturbing the base, getting the opponent at an angle in which he’s compromised and getting him to the ground.
Pull the arm to relieve pressure off the windpipe and tuck your chin.
Strike the groin to loosen him up as you step to the right with your right foot to get a base and better position to maneuver.
Slide your left foot toward your right foot.
Slide your left foot behind your attacker in a position that will give you better leverage to peel him off.
With your left reach for your attacker chin and grab it.
Pull back and down on your attacker’s chin and head.
Pull him all the way off of you and to the ground.
As you can see, you pull the opponent in a direction in which he has no Bracing Angle, or no base. Of course, as is usual in Kenpo, the original technique involves using strikes to put him down.
So, those are some pretty clear example from Kenpo techniques of using Angle of Disturbance against an opponent.