In the Wado kata seishan, after the slow, under tension segment of the kata, we block and punch to each side and then to the front.
We then punch to the nose, simultaneously bringing up our knee before striking uraken (back fist) behind us in shikadachi (sumo stance).
My question is: When we raise our knee as we punch, should our toes be pointing down or should our foot be square and why?

I have seen it done both ways and everyone I ask has no explaination as to why they think they are right. (perhaps the foot shape is irrelevant?)

Anyway, I would be glad to have some opinions, even if nobody actually knows the answer (I don't know how may of you have a background in Wado).

Thanks in advance