First John props for sharin your vid & your ideas and explainations, a moving picture is worth more than a million words, so good on you:)
Like the others have said, the way I would use pak da would be different from what was showed in your vid. All actions go towards that opponents spine to off balance him, so when a bridge is developed like in a pak sau, thru the contact point you attack the spine (center axis). Like Kevin G explain, the next attack would immediately come thru and take over that line with enough structure behind it to handle any interruption that opponent might give you, as I quote Kev ,“the leading striking arm following SHOULD take over the leading attacking action and create a barrier with its forearm that makes another hand redundant…2 hands dont need to fight one.
The leading arm, through alignment drilling in chi-sao should form a solid line of force as it strikes, bent, and utilizing the body weight and stability in the 3 actions at once idea.” It sounds like fantasy, but when you learn the method it works, or allows you to pull this off.
One alternative that I have learned, as there are many, is to use what I call a “cutting” striking action. In your clip your partner throws a right jab, instead of pak’g with your left hand just strike over top with a bent arm, via fok sau training. We perfect this idea in our pak sau drill, learning the right angle, stepping and facing.
Now here’s a clip that Ernie (my VT coach) made when I visited him in LA 09’, http://www.youtube.com/watch?v=shePFekjsC8 , in some of it there are 3 frames going at once. In the beginning of the clip, watch the middle frame, he’s explaining (sorry no sound on the clip) how to do it to Craig, then at :06 he does it till :032. Notice first how he always finishes with a push, our way of projecting our structure into our partners, a training method which works our horse, then he gets me (I’m his partner in the drill) to followup attack from various angles, so as to learn what to do if it’s a combo attack (which is likely what is going to happen). At :44 second in the clip, the right side frame is where we bring realizm to this idea, here I am feeding lead jabs to Craig and he’s cutting the jab with his strike and entering in with follow up, a isolated sparring drill (take it easy on us, as we were just learning this that day:)). Again notice how Craig is staying in striking range and forcing me back, taking my structure out of play and putting me way on the defensive. The clips also shows some of our laap sau drill and chasing drills.
Regarding your alternative you put yourself out of your own “VT frame” as I like to put it, your facing his back and way inside, clinchin range. At this space it’s take down time IMO, and from there you GNP which is good as well. I wouldn’t stay and strike from a standing position much from that position/range with a VT type method. Of course one can stay and strike if they want, as the are some vulnerable areas, but the opponent, still being on his feet has the option to just run out of range as now his back is given.
Thanks again for sharin,
James