General Choi telling a North Korean NOT to twist his body when punching. "Just go up"

[Badhabits]

Someone correct me if I'm wrong, but I'm not seeing the correlation between Dempsey's drop step and sine wave. He never talks (in his book) about any type of rise before the drop step. The only prerequisite he mentions would be having at least a little weight on the front foot. He does say that one of the great things about the drop step is that it has no tell before it happens. Wouldn't a rise prior to doing it be a tell (unless you're already rising for another reason)? He goes into detail in his book, says the front foot is lifted, body pushes off rear foot as it begins to fall, no sort of loading it up other than some forward weight.
I've had some training on the drop step, there was never a rise worked into it. Maybe other people do it differently.

 

[windwalker099]

He does say that one of the great things about the drop step is that it has no tell before it happens. Wouldn't a rise prior to doing it be a tell (unless you're already rising for another reason)?

You're correct, Dempsey didn’t show an obvious rise before the drop step, in order to avoid telegraphing.

Nor did he describe his method as a sine wave.
Functionally, the motion still follows a wave-like pattern:
the body drops, the fist rises, and energy flows through the frame.

It’s not about a visible lift, it’s about smooth internal transfer, much like a sine wave:
the body loads and releases without interruption.

For those interested his book Championship fighting
outlines the drop step.

 

[Earl Weiss]

Nor did he describe his method as a sine wave.

I think General Choi may be unique in the use of the term which he found convenient to contrast with "Saw tooth" and "Flat" wave. While the term was unique - the idea is not as can be seen from above posts.

 

[Badhabits]

"Falling power" I think is pretty much used across all arts I've had training in. It's the terminology and descriptions that differ. Falling power. Sinking power. Borrowing energy from the earth. They all cross over. In the West, Eastern terminology tends to sound all woo woo to us. Tell some guys doing a drop step they're "borrowing energy from the earth" they'll look at you like you have three heads. Fun stuff.