Well , I usually just start stepping forward and back to test out their stance and their balance.
If I find the stance is weak and their posture is all over the place then I will raise my Fook Sau and Tan sau at the same time to off balance them and strike through with Tan Sau to side of the neck.
If I find their stance is strong and they have nice even rolling , then I usually just tend to bounce off them lol and go back to the drawing board.
thank you, this in very interesting.
Salvatore