How to untie this hand?

In the middle picture, there is a small crescent on the top one, and the nails will naturally open after being broken here ~ the new one is a little tight! If it is not fully open ~ use a nail or a small screwdriver to tilt the two holes in the middle of the third picture, it should be open! (Note: Never use brute force, but try with limited force that you think is impossible to destroy! It shouldn't be difficult to observe and study more) I also use pictures and my own good manual experience to help you analyze it ~ not necessarily my method is correct, I just suggest! Wish you success!