Kev you still haven't answered the question re the punches on the heavy bag. I hope that your footwork is as evasive as your posting
?
If they're still concious they may step back or stumble, unconcious people go down as their legs buckle beneath them even if their body position means that they fall backwards they crumple not fly across the room.
not the way its shown on you tube, no. I've broken boards and smashed fruit etc for show but never pushed a volunteer across a stage into a piece of board or onto a chair. It is completely alien to my understanding of fa jing and the idea of on off energy.
I'll leave it to you to wrap up this conversation. I've expressed my POV and we clearly have dipole positions on this. Each to their own