I understand what he is trying to show once the punch gets stopped. I just don't think I agree with how he gets to that point prior to that. My problem is no one will leave there arm like that. Most fighters will have there hands back near there face like more of a boxing/mma guard. Next, if you punch from out of range/ boxing range you will probably eat a few On the way in. Can you elaborate on how you would get to that point of contact shown in Vid with out It relying on some one leaving there arm out like that ? It's just risky unless your Bruce lee fast.
Doesn't really matter Jake whether his arm is further out or closer to his face , there are techniques that will take advantage of either situation.
If the arm is out you can use the Chum Kiu Pak Sau which hooks around his wrist and pulls him in.
If the arm is closer to his face the angle of his arm is weaker and able to be collapsed with a regular Pak Sau from Siu Lim Tau which travels in a more forward direction towards his opposite shoulder.
The point of the matter is we want to punch through the centerline but there is an arm on the centerline barring our way.
If both of his hands are off the centerline and leave a gap we can use the double piercing movement from Chum Kiu to go between both his hands and strike through.
You are correct no one is going to leave their arm out there at that angle , but don't forget the same techniques can be used if the other party decides to initiate with their own punch instead of guarding or blocking , they serve a double of function of either breaking through a guard or deflecting an incoming punch , then at the point of interception their arm angle will be quite open as they try to punch through your technique.
But students that are learning the technique have to start somewhere and need a reference point , that particular dude just seemed to have his arm pretty far out.
But as I said , arms further in or further out the techniques pretty much stay the same , its only when the opponent has a more open guard with both hands off the centerline that the technique will change.
We know in the real world that the arms could be close in shielding the head or their hands might even be moving around rapidly in a more dynamic type of guard , but students have to be able to get through the basic ones first
But to answer your question more fully about how you get to that point in the video , well the answer is if he is close enough for you to step in and hit him , you just step in very explosively and hit him.
If he is just outside of normal stepping range as is likely in most encounters you don't step in because he will evade you and counter.
Being just outside of normal stepping range means that he is in perfect range for a low heel kick to his forward leg , your low heel kick will also keep him just outside of his own punching range , and the pain of the kick should also serve as a bit of a distraction as you enter into your punching range.
So you just bridge the gap with your low heel kick and then use the entry techniques shown in the video , the entry techniques can also be done at exactly the same time as you do a low heel kick/ stamp kick , but now we are starting to get into chain kicking territory.
Hope that helped a bit.