Bon Sao
The bon sao / which foot forward thing is of course pretty theoretical. If you manage to redirect incoming with a bon with either foot in any position, then your bon worked. To be able to decide in a fight which foot you want to have forward when you need to use a bon is luxury indeed.
I feel the use of the bon S73 discussed is a matter of strategy and intent. I don’t necessary agree that the forms dictate which is the better structure, either.
The WC I have been taught wants to use bon to get to the outside of the lead arm (not exclusively, but…). IMHO it is easier, not harder, to shift/circle outside the incoming attack with the same foot forward than back. If you are outside the opp’s arm, he can’t steal your centre, though you can get around his.
We do a bon sao larp sao drill with both partners having the same foot and arm forward designed to develop the necessary attributes to use this strategy effectively.
I agree that the opposite side forward does allow one to “dig in” more behind the bon, but this is not always required as bon is most frequently used as a means of redirection. You can only turn so far towards the punch coming in this way before your structure gets twisted, necessitating a step.
While much of our forms, and the dummy, use bon from a “side neutral” position, the energy goes forward along the central line, more along the direction of the “same” foot rather than the opposite foot.
To emphasise, the structure used must support the strategy employed. S73’s strategies may differ from those I employ, and his structure may support his strategies at least as well as I believe my structure supports my own.
I agree with WH that both hands should be forward, as opposed to both out to the sides or one tucked behing your back, and that the intent of that phrase not be trivialised. But most styles tend to shape up with one hand or the other further forward, so that there are in effect two lines of defense.
ONce again, it will be a wonderful thing if you are given time to snap into a preparatory stance when you are attacked. Oh to be so lucky.