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For the "correct" answer you know who you need to ask. I can only speak from my incomplete understanding of the broken WC/WT/VT I have studied which I will henceforth refer to as "BVT" (Broken Ving Tsun) so you will not confuse it with the correct VT others may study.
Now from the standpoint of BVT,
chasing refers to attempting an attack or defense indirectly by following your opponent's hand movements off-center rather than by executing direct attacks at your opponent along center.
So rather than concern ourselves with inefficient and typically
late attempts at responding to our opponent's hand movements, we seek to attack and dominate centerline, forcing the opponent to respond to our movements.
If our centerline attacks are intercepted or obstructed, then we employ a remedial action to free our attack and clear the way to continue attacking according to the motto,
"Loi lau hoi sung, lat sau jik chung".
When analyzing an exchange
(for learning purposes) we look to see if we have moved as efficiently as possible, without unnecessary deviation from a direct path to attack. Optimally, our defenses should be a byproduct of the attack itself
(da sau juk si siu sau --attacking hand is defending hand) and be executed as a single movement with the punch functioning also as our defense. If that is not possible, then we seek simultaneous attack and defense
(lin siu di dar) coordinating both hands to work together as with tan-da, gaun-da, fook-da, lap-da, etc.
I agree with what has previously been said about there being an
objective standard about what is the best VT, at least with the BVT I train. If, for example you can break down an exchange and show me wasted movement, or unnecessary and off-center movement responding to my opponent's hands, or other inefficiencies, then you are showing me
errors in my VT. And that is true regardless of the system you practice. For example I've had people like my
Escrima coaches Rene Latosa and Martin Torres show me more efficient ways to move. In that instance, they weren't just teaching me FMA, they were correcting my VT.