Hey Futsao! Been a while, thanks for the video.
Interestingly, the Yip Man WC chain-punching I learned from Leung Ting was also very relaxed, but opposite yours in that when I first met him, I used to punch simultaneously pulling back the retreating hand much as you show in the video. He made us deliberately unlearn that habit and focus on the "yang" punching hand, and not pulling back the "yin" withdrawing hand until the punch had fully crossed the bridge ...much like the delayed withdrawal you mentioned toward the end of your clip. That was exactly what he wanted us to train!
The main reason he stated for punching this way (without forcefully withdrawing our punch) was that we should never withdraw energy into ourselves, as that offered our opponent a chance to follow the energy back into our center. The push-pull method you advocate reminds me more of a more relaxed and on-centerline equivalent to the push-pull punch of karate. I imagine you have had good success with it, but it would not integrate well into the "WT" system I learned.
