Thank you so much for your comment.
My initial idea wasn't a typical ragdoll, but rather something more like a robot....a clean, crisp movement, and the movement should almost freeze when the string is pulled tight...So I used Unity's Articulation Body to connect everything, and try to change the stiffness of the joints during play, but failed achieve that effect.
I originally included part of the video below in the game, but for some reason, the web version couldn't play it, so I replaced it with an image.