mook jong man
Senior Master
As long as one of your hands is chasing center, that's good. But, your opponent has another hand as well. That's why I believe it's always preferable to chase center with both hands whenever possible, so that either is a direct threat.
Maybe we're arguing apples and oranges though. It sounds like you're describing pak-sau from a point of contact, where his hand is already in contact with your guard. That is the best way to use pak-sau, and in that case, you can feel where he is definitively thanks to the contact you've made. I was refering more to the use of pak-sau in an out-of-contact context, as demonstrated in the video. It is not uncommon for me, at least, to find myself hitting thin air with another fist in my face upon trying to enter on someone with pak-da, for example. A fighter will often just pull his forward hand back and hit you with the other. That's what's dangerous about chasing the wrist while out of contact, I believe.
Incidentally, the same is true of intercepting round attacks on the inside. A lot of people try to intercept them at the wrist, but I feel that's far too risky. It's safer if your priorities go: step in, hit him, cover the line. You'll usually catch him around the elbow this way, but still with plenty of structure to avoid being hit yourself. And the important thing, of course, is that you're hitting him and disrupting his attack that way. Chasing the wrist, you have to turn further away from your opponent, and are more committed towards chasing his attack. Not only can you miss if he changes the line of his attack, but if you fail to connect, you're in a bad position for his follow up as you have more distance to turn.
Tok-sau. Get up underneath him
But, generally speaking, if his arms are fully extending to reach you, then his elbow will be somewhere around the half-way point. That allows you to intercept the elbow with a bent arm. At the same time, you should be moving in on him to counter, which further shortens the distance.
Usually you want to intercept before he's fully extending his fist to you, but we are talking about pressing the elbow, and generally, the best opportunity to do that is when your opponent's arm is fully extended and he has a weak structure anyway.
But I'm with you here. If you're over extending your arm to reach his elbow, you're putting yourself in danger.
I honestly don't think much about where I'm intercepting. I just close the line, threaten the opponent, and respond to pressure. And if an elbow presents itself, press it.
Rather than turn this Sherman guys thread into more of a Wing Chun thread than it already is , I think I'll take it over to the Wing Chun section and find out what the other lineages do.