Tied Elbows and Arched Backs as Bidirectional Flow Symbols
The "story" will be about war captives maybe becoming slaves. But look at other examples in this collection and notice both kinds of flowers, lotus and a pointed-cones-flower, which mean opposite flow directions. They are opposite polarities. A red fruit flower like image C, is an equivalent outflow symbol to the cones-flower. https://ca.pinterest.com/stevenbhalls/slave-line/ So it seems that elbows tied behind the back is strongly correlated with having bidirectional flow symbols nearby.
When a back is arched backwards like images D and E, I suspected it was about "up on one side, down on the other", the common pattern. Seeing this on a crook handle, suggests these arched backs can be a standalone bidirectional etheric/high-density divine symbol. More examples in this collection. At least one will be shocking. https://ca.pinterest.com/stevenbhalls/back-arch-bend/