it works due to empties, who are locked to each bone origin.
then per metabal you can do a lock to the same empty (it doesnt matter what you lock to what first).
there is also a metaball rain in the figure just to prove it is a metaball.
also strange cycle material test, its glass for camera rays but not opaque for non camera rays
(that explains the right foot shadow, just before you ask about it).
Small test since i red somewhere that bones couldnt control metaballs, well it can.
and the only light source is inside the figure, kinda odd, but oh well it was only a test before i release the “Blob”…