An 按 and it syncs with Newton's 3rd law

An 按 video link

AN 按 (push downward) Jin! And to paraphrase my own teacher Master Stephen Hwa who said:  "Sir Isaac Newton can't be wrong", so what happens here in a different presentation? In a previous video from Youtube and also published on Facebook, Master Hwa talked about "Fajin 1 and 2" and in 1 he compares "ordinary force" and "fajin". In one of the videos, he has a student kicking at him and uses "TSAI" to pull with fajin. His backward "reaction force" is nullified, but then he is pulled forward with the "reaction force". The movement "AN" shown here is really a downward push movement of long duration and "stays" with the opponent (yours truly) longer. This is unlike many other fajin push movements that push opponents away and this "stays with". It is very useful in sparring exercises. This particular use of the "An" move is found in the Tai Chi form right after "cross hands" where you do half body turn, step 180, and "diagonal brush knee". The important point here is the initial force is fajin and this has an external followup move. The fajin has a "tenses and relaxes" action but no "return path. With no path for a return (reaction) force, then Master Hwa's body is not being affected. In other words his arms and body do not remain tense, the "tension" is very brief. The followup is external and shows a reaction force as Master Hwa's steps are pulled to the direction of where the opponent moves.