Its not so easy as to jab the eyes, first of all actually jabbing the eyes with full speed and precision is not easy. Now try it on a moving target, who constantly and randomly ducks his head slightly, or moves his head in case a punch comes his way. Maybe when a person is sitting stationary like in the clip, it might work. But as in another topic, most people have almost lightning fast natural reactions to move, blink or do anything to avoid getting jabbed in eyes (even if it costs them getting hit).In a spontaneous situation, pre-emptive strike, you could get lucky.
As most masters say, chi sau is not fighting, not even close. Like push hands, its a sensitivity and developing (strikes, blocks etc.) tool.
I'm starting to go the route of how most MMA's talk about this kind of stuff. I hear many WC people say "I can easily beat ground fighters because they arent prepared for my vital point hiting!" or that if they are on ground that simply gouging eyes out works, its not that easy, especially when you are getting pounded on by someone on top of you. And if you did you are givng them an arm bar.
Honestly, I dont see anything impressive about the fast hands clip. I see no real power, intention, or fighting skill. I see shoulders lurched up, sacrificing power for speed, an opponent (less skilled) that is just sitting there letting it happen. While I think its impressive in the chi sau sense, I definitely don't see it in a fighting skill sense. The face is the most heavily protected place, yes even by MMA's. I love WC, but sometimes its structure seems so confining to me
It is true that by closing and opening chest cavity you can generate power. But usually not enough (on its own), and I didn't really see any of that there, but eh, its just my opinion.
