I wasn't so much concerned with my upper hand.I made the clip for another Wing Chun Sifu who wanted to know how we used the Fook/Fuhk. I was mostly concerned to show him why the elbow concept (Mo Yul Jiang), immovable elbow was important.
In NYC I've fought some CLF guys. They'll strike and hope you block so they can use a corkscrew punch and fall into a Sei Ping Mah and strike you with a Ginger Fist in the rib cage. Yes, my high block was not "on point". I wanted to show the other guy that you can apply a Fook even when attacked to the upper gate. I was using 0:27 in the following clip except I was apply it from the Central (not center), line.
http://www.youtube.com/watch?v=XcwwzgIwaLE