So for the example, what hand forms do you (or did you) use?
Well, a lot is tegatana
, hand-sword things. I focus on different parts of the "sword", depending on what movement I do: the edge, the back, the side, the tip...
I also let the hand roll a lot on the wrist, while usually the fingers show the direction of my intention (ki
, if you like).
Here is sort of a short example: