Originally Posted by
LFJ
Specifically, the teui-ma or 'pushed step' collapses backward on an angle which still allows forward pressure to be returned to the opponent via a new line on which they are weaker. It's therefore not truly a 'retreating' step.
This is one method of applying the 'loi lau' (when the opponent advances, you remain) principle in order to keep constant forward pressure as I've been discussing. When the opponent is caught on this bad line they'll often try to evade or retreat in order to recover. That's when 'heui sung' (when the opponent retreats, you chase center) comes in. LLHS = constant forward pressure.
If our centerline attack is met with obstruction, when that obstruction is removed this forward energy causes our attack to automatically continue to the target. That's LSJC. If this effect is not happening, the problem is with LLHS. You're stopping, hesitating, retracting, or retreating, but not applying constant forward pressure. LSJC is the result of LLHS. That's my interpretation in a nutshell.