Bong Sau to Fak Sau
As soon as your Bong Sau arm is freed, keeping your elbow raised, your hand swings forward in a Fak Sau motion aimed into your partner's centreline at neck height. Additional power can be generated by throwing the elbow inwards and forwards.
Counters
If undefended, on impact cast your shoulder, tension your thumb and focus the energy generated through the outer edge of your palm. Your opposite hand, which has been keeping control of your partner's lap'ed hand, applies two-way energy at this point also.
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SeungyauhSidai - 11 Feb 2010