[Burner]

During coming back till Impact (or Releasing), it's reversed - the left wrist is uncocking and the right unbending.

The cocking and uncocking of the left wrist is a by-product of the bending and straightening of the right elbow.

Whereas the flattening of the left wrist and bending of the right wrist are joint ventures; they go hand in hand, pun intended. But, at no stage of the down swing process is unbending of the right wrist anything but a recipe for flipping.

Keep the right wrist bent (and maintain the integrity of the flat left wrist) until low point at the very least.