According to what I’ve seen (there is a slightly longer version of this video available, with subtitles), these tests are the “graduation exam” to leave level one and begin level 2 of the school, Mo Pai.
Because an individual does not fuse Yin and Yang energy within their body until level 4 (and thus cannot project their chi outside of their body), what is happening is that Chang is producing a thick field of Yin energy into which the student can project some of their accumulated (through the level 1 exercise) Yang energy.
So in a sense both master and student are part of what you see in this clip
According to what I’ve seen (there is a slightly longer version of this video available, with subtitles), these tests are the “graduation exam” to leave level one and begin level 2 of the school, Mo Pai.
Because an individual does not fuse Yin and Yang energy within their body until level 4 (and thus cannot project their chi outside of their body), what is happening is that Chang is producing a thick field of Yin energy into which the student can project some of their accumulated (through the level 1 exercise) Yang energy.
So in a sense both master and student are part of what you see in this clip