Wang Zhi Peng is a Wong Shun Leung-influenced teacher with a school in Mainland China.
This fluid changing is one of the things that distinguishes Wong Shun Leung’s approach to Wing Chun from the other lineages, especially as developed by Gary Lam. The integration of pushing, pulling, kicking, Po Pai, trips, and hitting adds the necessary dimensionality and surprise to the system. You can see it in the demo from Karen Armstrong in an earlier post. Her opponent pulls her and she steps into it and throws up a Lan Sao. Another response to that pull is a shoulder check. That can become a kick or a pull. It all depends on what the opponent and the moment gives you in terms of opportunities.
Most of the stuff in this demo is in the WSL system, but Wang Zhi Peng is definitely playing with some San Shou and some other system – all the stuff after the demo with the belt.