In this sequence he demonstrates the "knife hand block" from back stance moving into long front walking stance and "middle section punch" from a more strikingbased viewpoint. The "blocking movement" might seem a bit off if you are used to the "Kukkiwon standard" but it is wholly inline with the older Kwan (the schools that together made Taekwondo) method of moving.
The most basic application is a simple block punch combo and as far as block punch combos go this one is not that bad, yet it can still be used in more sophisticated ways as shown below
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