later on you learn to develop "splitting force" where you can choose any point on the body (usually the point of contact or somewhere close) and explode from there, using that point as the "base" rather than the ground itself. it's faster and doesn't telegraph.
If you pick an arbitrary point and "explode from there", how does that work, assuming Newton's Third Law of Motion still exists? Imagine this: I am on a skateboard facing my opponent (no ground support upon which to base my force) and I hit my opponent... what do you think happens? I'm having trouble imagining how a force appears as you've described it. Nice conversation, though, although it's tougher when it goes beyond the one-liners and gets into the facts of how something works, isn't it?