I think that idea is rediculous. I don't think im going "kung-fu" fight anyone in the near future in a challenge.
Here's the deal; When you are performing any (wingtsun/wing chun) movement, the idea is not to fight force on force correct? So yes, with some hard training and repetition you could be STRONG and FAST enough to perform this technique. In all actuality, pak-da is supposed to is not supposed to cross the centerline (just like every other WT/WC) technique. What you are looking at in the movie is a dramatasized version of JKD, not WC. Also a smart man would just run under the others arm, in more of a bong-da/biu-sau movement right?
I'm a big guy, 6'00/240lbs and even I wouldn't try this on another fella. There is too much risk of getting a counter before I could complete the technique. There is a difference between TRICKY WT and GOOD WT. This is an example of poor WT. Try this move on your sifu and see how fast he sticks to your arm and returns with a wallop of his/her own.
Also, the is a movie, so it is meant to be visually stimulating rather than for practical application. Especially when WT/WC has a much better solution (replacing...i.e. Bong-Da/Biu-Sau).
Thanks for the video however, and have a great day ya'll!