[QUOTE=Sihing73;1084558]Hendrick,
Please explain, in detail, what you mean by “opening the door”. Like I said, I am interested in a discussion which actually offers explanations rather than vague references and innuendos. While it is of benefit for the student to learn by experience and exploration, oftentimes, the inability to give detailed explanations sometimes means the person offering such vague explanations doesn’t know either. 
Not saying that is the case with you, but I would like to hear your explanation in simple, clear and consise language.[/QUOTE]
In all Chinese Martial art, different style has different ways of Open up the opponents before entering or attacking the core. Open Door Meaning remove the hinderance on your entering to his center path.
IE:
In WCK, comes accept goes return is an opening the door method.
and the above 4 methods I post previously
Or
Turn the attack into power something one desire.
Destroy the attack
Control the attack
Dissolve/dilute the attack
are the methods of dealing with the momentum before one could open the door and enter.
For CLF, the round snow balling momentum is the door, one needs to open that door to get into the core. So, in the previous post, I suggest, damage one of the door, so one can go in.
entering without aware of the snow balling momentum is suicide.
These are straight forward TCMA basics.
If one follow these basic, it is always clear. but if one doesnt think accord to the line of TCMA then one could be lost.
IMHO,
Dealing with attack in TCMA is never as over simplified as Avoid, Avert, and Intercept.
One can do all the Avoid, Avert, and Intercept, if the door of the opponent is not open up. Then one still out side the door. That do nothing much at all dealing with the attack.
Trying to intercept and enter with Brute force will end up like what Gary Lam says " you use Tan DA, lucky he is my student, otherwise I get hit already; who fast? me or him? he fast because he has started the…"
http://www.youtube.com/watch?v=u63OJRXyq68&feature=related
also, Gary doesnt go for the center line right away. he let it passed first. meaning he open the door via Dissolve/dilute the attack. but he is not just pure avoid or avert. it is a dissolving momentum open door act. So, it is not true that WCK always going for center line. WCK goes for the center line only after the path is clear.
Just some thoughts out of millions of thoughts.