“For the fighting, we have the best three timings.
When an opponent hit you, you hit him first.
This is the best timing.
Every time he hit, you hit him first.  This is the best timing.
The second is, when he hit, you let go, and on the way back, you go through.  This is the second good timing.
The last timing is, when he hit, you stop him, and then , you take his position.
Or you stop him, on the way he hit me, he will bring my hand in, and then I hit him.”
Gary Lam

From the excellent Devastating CHI-SAU Crossing Hand System DVD (co-starring my teacher Greg LeBlanc early in his training and his training partner Mitch).

I’m not getting any money for this endorsement!

Best introductory Wing Chun video I know.

I wish I could figure out how to advertise it and get a cut!

Gary Lam and Mitch in Lam's backyard Circa 1998