>>thought to descend from the prana-bindu techniques of the long-extinct Bene
>>Gesserit Sisterhood.
>
>If they're extinct, who did Jackie Chan learn the Wierding Ways from
>during Exile?

Well, if part of the BG's teaching survived to modern day in the biocontrol methods, then who's to say the weirding ways didn't survive?

Also, it's JACKIE CHAN. He probably found a scrap of paper with a single sentence about it, ate a sweet bean manju, and recreated the whole thing while fighting atomic ninjas.