My fantasy was about the same.
I just had that vision of one of those WC demos where the WC guy makes his slick move and unloads this massive succession of 25 chain punches all landing on vital targets while his opponent is frozen in place and cannot move nor make any attempt at covering, swiming in, stepping offline, going for underhooks or dropping down into a single/double leg take down, etc. None of that.
When do I get to learn the stuff that allows me to do this? :vu:
Your funny! lol!
Demos are demos, training is different. Sparring is different. You will learn to move with your opponent, no matter where they go, or what they try to do.
A guy shoots into your legs or hips those vital spots are exposed by the very nature of the shoot in. The back of the neck, head, knee to the face, etc. Alot of those people in the demos don't move much because they learn really quick that if they do it just makes it worse and more painful for them.
We've had students come in from MMA and other arts, even grappling that love to shoot in on Sifu. At the first couple of attempts they come in really hard and struggle and fight with everything they've got to get ahold of him, but after a couple of "sessions" of that, they ease up. They find that the harder and faster they shoot in the harder they get hit.
Simple physics:
The inertia and velosity of Sifu's incoming punches are doubled by the incoming inertia and velosity of the attackers shoot in, takedown, clinch, or strike. Added by the mass and body weight of both Sifu and the Attacker.
Pow! and Ouch!
Inertia x mass = power + the inertia x mass of Sifu's attack = double the power.