Bunkai: Pinan Sandan End
You step forward, twisting the whole power of your body against his exposed front arm, dislodging it and off-balancing him. Displacing his body with yours, you destabilize his body architecture and strike, simultaneously, to his head and to whichever mid-level target is exposed.
The End of Pinan Sandan
There are only two moves in which we turn our back on our opponent. Both are in Pinan Sandan. This video shows the one at the end: In this bunkai, for the last moves of Pinan Sandan, the end is victory. But that is not inevitable.