Locking in Do-San, Part 1
Locking in Do-San, Part 2
In this post I will finish providing applications for Do-San, focusing mainly on the spearhand strike and wedging block sets.
Head Hook Takedown
The supported spearhand thrust followed by the release motion and turn comes from the karate kata Heian Sandan, and has many applications. It can be used as a throw, for instance. Use the supporting hand to press on the small of the opponent's back while you turn and thrust their head downwards.
|Source: Practical Kata Bunkai|
The above application doesn't utilize the wrist turn -- something re-added in later by Gen Choi (fnt. 1). However, Matthew Sylvester has another takedown utilizing the release motion with wrist turn as a knee block. Karate Culture has a similar application in the bellow image: using the rotated spearhand to block the hip as the other hand pulls.
|Source: Karate Culture|
So the standard application you may have learned for the spearhand set is escaping a grab. You pull away with the release motion, then spin and hit them with the backfist. For a simple wrist grab this doesn't make much sense; why would you expose your back like this? However, some pattern analyzers have expanded on this idea and suggested that it's a wrist lock or armbar you are escaping, evidenced by the wrist turn (which also appears in the kata Heian Sandan).
In my previous post I interpreted the wrist turn as creating an armbar: turning over the opponent's elbow with your palm as you pull their wrist down towards your hip.
Now on to the second backfist: since the backfist uses the same wrist-to-wrist chamber as the low block, we can also use the full motion as brush-grab-strike against a straight punch. After striking our opponent's face with the backfist, step out and turn 270-degrees, pulling the opponent's arm (outer-forearm block), and then pressing forward onto their elbow (back hand punch).
Roundhouse punch defense
For the wedging block set, there's an application from Russ Martin that I rather like. The block is performed at a 45-degree angle, so we can use it to stop a haymaker/roundhouse punch. From here you can front kick the opponent's knee or, as Mr. Martin suggests, use the rechambering of the front kick as an o soto gari sweep.
|Application for front hand, back hand punch combination.|
Source: practical kata bunkai
Russ Martin has some other application ideas for Do-San in the source video.
To add a little more detail to this: the first punch after you sweep can be used to hook the opponent's head and push it forward. The second punch can be used to crank their head -- something useful if they grab you -- finishing the throw.
Double lapel grab defense
Ignoring the 45-degree angle, this set can be used as a double lapel grab defense. There are two versions of this: first, you can come over your opponent's arms and press them down with the wedging block chamber, then grab their head and press into their eyes (wedging block). Follow with the front kick to their knee or groin. Perform a knee strike instead if you are too close.
|Wedging block chamber|
as a strike.
Source: Fighting Arts
If you want something fun and different to practice, wedging block followed by front kick may be used as a tomoe nage (circle throw) sacrifice throw. Read about it here. Use the wedging block to grab your opponent. Then, as you fall on your back, use the front kick to kick them up and over you.
The riding stance knifehand strike is commonly interpreted as a simple wedge throw. In Capoiera this defense is so common that it's been given the name of "Vingativa" (meaning "vindictive"), named because it is used as a quick counter to a missed kick. However, the movement may be used against a hand strike as well.
|Capoiera's Vingativa. Source: Howcast|
From here you can sweep out the opponent's leg and pull their arm. Use the foot movement into the second knifehand strike as the sweep. You could also interpret the second knifehand strike itself as a further pull (if you keep your hand closed), although it's likely just practicing the motion on the other side.
|Sources: Tom Hill's Karate Dojo and Tigon Karate|
1) In the 1965 version of Do-San, there are no instructions for a wrist turn, and old performances of Do-San do not include it. However, it exists in Heian Sandan -- the form this set is taken form -- and Gen. Choi added the wrist turn back in by the time of the 1986 version of the Encyclopedia of Taekwon-Do.