[Grandmaster Chu Training Episodes #004]
This footage goes in tandem with the #003 one. It shows more the forearm attacking in a seemingly swinging movement, first to the exterior zone, then the interior zone.
It is more highlighted that the arm is not acting as one whole piece, but in terms of separate yet synchronised rotations in joints. (Refer to the post [Rotation in Joints (Separate but at the Same Time) – Composing Movements] dated 2013.12.12.)
The role of the wrist is more obviously seen too.