I'm not PB. WSLVT is the same for anyone who spent the time and learned fully.
Paak-sau is an auxiliary action opening the line for a punch with a short shocking force for displacement. There's no head-on confrontation or separation from the attack.
If this drill is to be used at all, it is for beginners' very basic hand-eye coordination checking forward with man-sau, and using some basic entries to train coordination of the step with upper body and limbs moving in to capture space via correct angles.
Some, not knowing any better, take it too far and turn it into a free application/sparring face-off that they use well into their VT training. This is problematic for many reasons.
First, if you are taught this is paak-sau you are trained to stand there slapping chain punches with it. Paak-sau is now not part of an attack, but is used to chase hands. Even once is bad.
Second, it is conditioning one to look for contact and then retract as that contact is also retracted. This is detrimental to LLHS,LSJC.
Third, it creates an arm's length distance and allows the attacker to face us square-on, then has us step in going straight for the arm with various techniques, which gives the opponent the advantage as they get to attack the person while we attack the arm.
Even when some teach for the paak-sau to turn directly into a punch, they are timing when to cut in on an arm, and forgetting about breaking into the opponent's retractions. Too much focus on the hands and losing sight of the goal. Turning a beginner coordination drill into an elaborate application/sparring platform that detrains VT fighting behaviors.
The idea of VT is to find the most simple, direct, and efficient method of attack (Cham-kiu), not allowing a face-off and fighting force with force up the middle like a bull, and to remove obstacles with attacks and not blocks.
