Its about time I write something on this blog. At least to keep notes for myself.
So lets talk about Seisan Kata.
There are a series of three moves where we are stepping to Seisan Dachi. During these steps both hands are at the side with the fingers raised, the wrist or "heel" of the hand being at the lowest point (this provides a form of Hikite). As we step, the hand on the same side as the forward leg performs a sote-uke movement (move the hand to the opposite waist and move it across your front in a sweeping Soto movement). However the hand was arranged like a Heito but the thumb was set to provide the hook in what we called Tekube-kake-uke (hooked wrist block).
But this appears to have changed (or I was just doing it wrong). Regardless, the goal of this movement now is an intercepting block using the back of the hand. This actually improves completing the next step which is to then rotate the wrist and grabbing the attackers arm/wrist to pull them off balance.
This approach is much easier and softer and takes a lot less energy.
This form of block is called Kote - Uke