Some questions about Lessons 13 and 43

Hi, Bruce, your video lessons are well presented with clarity and lots of valuable details. Thank you very much. I have some questions and hope to gain more understanding from you.

1. Lesson 13, Turning the Hands Inward and Outwards
i. If the hand starting position is vertical with the palm facing inside of your body, then there are two ways to turn inward and two ways to turn outward, right? How about if the palm is facing upward or downward? Is there only one way to turn inward and one way to turn outward in that case?
ii. Can you demonstrate the turning hands inward and outward in commencement again and use the thumb or pinkie to indicate the turning direction in a very visible way? Really need help to understand “turning inward and turning inward more” in Lv and An. Also need help to understand the “turning outward more” in Ji.

2. Lesson 43, Left Single Shoulder Stroke
i. Which direction is the wall moving? When done with body turned 45 degree, is it in the same direction of the front foot? Or is it in the plane of the upper body (in which case the body moves side way)? It looks like the central channel is tilted during the bending phase of move, is the kwa titled? Is the central channel vertical after the stretching ends?