hello i have done wing chun for some time now and wing chun is a style designed for defence. ok try not to get yourself on the ground but wing chun teaches you how to figh on the ground too.Biu Tze is a recovery form incase you make a mistake it will gain the centreline back. so really you do need your foot any higher than your waist,(thats what your hands are for) and be honest Wing Chun is one of the few martial arts that acctually work
Dont think feel, if you get cought up so much with thinking in a fight it will jam your thinking will your shock and you will freeze, so just let your hand do your work let you brain sit out.

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