I agree with this. Anyone who has sparred with me knows that when someone grabs me, can tell you that I escape the grip and not the contact. If I lose physical contact, then I lose the tactile sense. When this happens, the body becomes blind. As long as I have contact, I can sense what my opponent is trying to go, or what they are trying to do.I also don't believe Song can do anything different here. The moment that your opponent releases his grips, the moment that the connection is broken.
This is one of principles of Martial Arts. It is why the arms are kept light and relaxed and not tense. Tense body is like yelling what you are trying to do. Relaxed body is like a whisper in a noisy room.
When someone grabs my wrist. I think "where are they trying to go?" They do not want my wrist, they want something else. Grabbing my wrist is for the purpose of moving it out of the way so that they can get to somewhere else.
This is why many wrist grab counters involve locking your opponent's grip so that they cannot release it.
WindWalker's Video in post #80 does one thing that most people forget to factor.
1. it's an explanation of a concept
2. The person assisting has one goal and purpose in mind. Grab the Arm and don't let go. In fighting it is almost always the opposite. Grab the arm for a short period of time and then go somewhere else or do something else that has nothing to do with wrist. It is common
If I'm keeping contact, then I it's usually because my goal is to restrict my opponent's movement, while positioning myself to have an advantage in movement. I think this is universal even in striking.
For example, Close in boxing. Notice the contact. I also think this is basic fighting concept with many levels of understanding.