Hi exile,
Would you mind elaborating a bit on this part of your post?
In your reference to the first moves of the Ki Cho hyung, do you mean the downward block? I could see that representing a defense against a garment grab on the shoulder (the downward movement of the blocking arm could be peeling off the grab and moving into an arm bar)...
Also, in hikite, could you explain what joint is being locked? Is it the wrist or the elbow?
Howard—it works like this:in response to a grab to your arm or the front of your shirt, cover the grabbing hand (call it H1) and rotate your body 90º while pulling H1 towards you, thrusting your other forearm above the attacker's extended elbow (E1), moving your bodyweight into the pin thus on E1, forcing the attacker's upper body down, while twisting the H1 wrist counterclockwise. At this point, you're outside the attacker, you have leverage on both E1 and H1, your attacker's head is in close and low, and you can release the pin on E1 to deliver a very hard spearing elbow strike to the attacker's face followed by a hammer fist to his throat. The 'retraction chamber' is the wrist grab-into-lock plus the pulling extension (enforced by the 90º rotation). The down block comprises (i) the elbow pin on the attacker's arm, forcing his upper body down, (ii) an elbow strike on the way up to establish the 'chamber' of the down block, (iii) a spearing elbow to the face strike as the 'blocking' arm descends, and then (iv) the 'block' itself, which is a hammerfist to the attacker's throat, temple, collarbone or any other high value breakable target. The critical point is that the initial wrist grip and twist forces compliance with the pulling extension of the attacker's grabbing arm; the elbow pin (the actual meaning of the first part of the block's chambering phase), with strong projection of weight into the pin via the 'front stance' movement, drives his upper body down, and all the rest follows. I've taught this application of the first two moves of Kicho Il Jang (a straight importation of Shotokan's Taikyoku Shodan proto-kata) to nearly complete beginners and they get the wrist twist/arm pull easily (
way more easily than they learn a proper chamber for a roundhouse kick, but that's another thread topic).
Just for some context, I trained in Ji Do Kwan for a few years quite some time ago before switching over to Hapkido. I never learned a single joint lock in Ji Do Kwan.
Nice topic for discussion.
I interpret pretty much every hikite retraction movement in TKD forms as as a pulling/controlling move, typically implemented via a lock. It seems almost formulaic... but there's plenty of evidence now available that grabs to the arm or clothing are among the most common violence-initiations in street attacks and similar assaults. And once the student recognizes that such grabs represent a gift (in disguise, of course!) from the attacker, to be capitalized on by use of pinning and locking techniques, it not only opens up a world of SD possibilities that the student hadn't imagined, but changes the grab itself from something maybe parylizingly scary to a much appreciated opportunity to terminate the attack quickly and decisively).