I am curious about this puzzle on unlinking the fingers of a rubber man. (https://www.youtube.com/watch?v=olHV4qvSDg8)
However, despite the illustrations in the above video, I can't visualize the step (C) to (D). I am ok with (D) to (E).
Can anyone describe what is going on from (C) to (D)? Or even better, any links to a clearer animation?