Awsome Key In speed 6 sec. Knockout punch by Master Karan Narang

[pgsmith]

I can't believe you found that!
It doesn't make any more sense now than it did then. I remembered him going on about the fastest strikes, which made me think of it in relation to the current thread.

Blast from the past!

 

[marques]

I was there ..and i can confirm that the guy not had absolutely time to move up

Not talking about the specific video, any jab is fast enough to strike the head. The thing to do is to keep the right distance, preventing any effective (first) strike.
In this video, the thing to do is start defending (moving) after the tiny step of the striker. After that anything is potentially too fast (powerful or not).