Jahmez, I must go watch that video and re-think the entire "jolt" based on your comments, because that is not what I understood.

None of the following is reliable until I go do that further research....

My first impression (unverified) is that I understood Dempsey to mean dropping weight onto that front foot moving forward by simply LIFTING it from the ground with no other weight transfer (i.e., no shift to the rear foot).

Because the center of gravity is forward of the only support (i.e., the rear foot) the body will jolt forward and the hand making contact will (very briefly) become your second point of contact driving that hand harder into the target -- until that foot almost immediately returns to the floor and takes weight as the hand retracts.

It is a critical move to time -- and the foot returning to the ground can ensure that no overcommitment nor balance loss is experienced IF the strike misses.

Caveat-- I haven't done this in combat but believe that I can safely coordinate it -- after only a few dozen rounds or practice over a couple of weeks.

I have done something similar, but yet quite different, as a demonstration of the 1" and 3" punch made famous by Bruce Lee. I learned this some 30 years ago. There are about 8 steps but one of the primary ways that force is generated is placing the leg corresponding to the striking hand forward and then dropping BOTH knees several inches -- just completely relaxing into a "fall". The front knee being forward TURNS the body to the opposite side thus converting gravity/weight into rotation and extension.

It is highly critical to time such moves and they do take practice.

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Herb