bong elbow goes up, wrist crosses the strike/centerline, fingers point to bicep's....sharp action, then bring elbow back to inwards angle to strike...., repeat 1000's of times and it becomes a simple action .
NO forward spiral energy....remember your attacking forwards, any energy you direct forwards is meeting force...
think of the bong saos energy as a conveyor belt traveling left to right and vice versa....in front of you, any wrist energy that touches it goes laterally to open a strike line up
....if you try to put energy on the conveyor belt it takes the energy sideways, no matter how strong ....
guys who use incorrect wristing forwards energy will easily be opened up...
if you apply the same energy while sparring using the bong sao, it will 'slap' strikes sideways for you all on its own ...allowing you to strike quickly while facing the guy, not turning away to do bong then back again...too slow.