Your attacker’s force
A key thing to remember if you are ever assaulted is to slow the attacker down. An attacker depends on the element of surprise to be successful and so he will likely act suddenly and fast. One way to do this is to plant the bottom of your foot on his knee cap. If you have rooting, that is, a good plant on the ground with your other foot and a vertical posture, the power of this defending foot is not even as important as the forward pressure. You can slide this foot to either side of his and press. All the while you must keep your hands in a position to protect your upper body. In WingTsun, a kick is always accompanied by a hand technique. Once you have done damage to your attacker’s knee, you can advance forward and rain on his parade with chain punches.