Check out my forum on Taekwondo's Chang Hon: Won Hyo Hyung
We did this as a green belt drill in our last session.
There are natural movements and combinations through the various martial arts, Taekwondo included. These combos are seen regularly through sparring or self defence. For instance: jab-hook, kick-punch, jab-kick, etc. Bunkai or drills needs to introduce this concept to the student and prepare him to defend against them.
Step 18-19 of Taekwondo's Won-hyo Hyung is a reverse scoop block at mid-section. Aside from other more exotic interpretations like a neck break, one of the drills I use is a traditional intepretation that pits the student's scoop block against a kick punch combination. In particular, a front kick plus a lunging jab type punch.
The scoop block performed in the pattern is done dead straight, with movement culminating in what seems to be a mid level yop marki (or middle block).
In performing this technique against the kick-punch however, the body is encouraged to rotate freely, and the arm is turned so that the elbow faces forward. This means that the forearm is much more vertical than if the user were pointing straight towards the opponent. A vertical forearm is a more effective blocking tool for a kick than if you were to only reach out for the kicking foot with the hand. The point of impact can be anywhere from the ridge hand area to the forearm.
The scoop block is not allowed to swing too aggressively to the left or opposite side. Having a large swing increases the distance covered and reduces the probability that you can block the ensuing punch. With elbow centreline, the mid level block is done using a lot of latissimus dorsi contraction. This helps 'pop' up the arm to face level after dealing with the kick. It also means that both arms are staying centreline to protect your fact and chest. --> if the arms are too way out either way, the lats movement would be pronounced enough and is an indicator that the practitioner has not received enough jabs or punches to the face!
Whatever it is, the elbow is forward so that if there is not enough time to effect the mid level block, the elbow can be raised and the face lowered behind it so you can deflect the punch with your elbow.
Don't forget to provide coverage with the back hand!
ps - the opponent doing the kick punch needs to do the kick punch realistically. Meaning after the kick, you drop the leg and use the downward pull of gravity to lunge your body forward with the jab or lunge. If you do both techniqes separately, it'll just be unrealistic.
Won-hyo: The Kihon Kata Coma