Every system I've been exposed to that does balance disruptions uses the triangle concepts - though some don't explain it with triangles.

My english isn't that good but I will try to answer....
The question mark is a principle that describes the end of your opponents lever (hook of the mark) and the tail the redirection of this movement of that lever....
Actually the question-mark motion is a screwing motion that moves the joint (or entire body) of your opponent in a circle away from his strength.... Then, after his center of gravity is off-line, you can move him downward in a straight line.... You use the way the joint has a tendency to move to take away his ability to resist before collapsing it...
I find russian martial arts concepts very close to fmas (some of their empty hands could be mistaken for filipino silat), they also have triangle principles and make a large use of slapping techniques like some Arnis systems... this is very surprising...
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