That is not a b-twist. It is a pretty much vertical spin with a pretty bad shuriken hyper variation and an honestly awful hook kick in the end. I'm not a fan of the U-dip setup, as an opener it's alright but the execution is not good at all. You need to be more inverted to make that hook kick higher, and you need to follow it through as well instead of holding your hip in the middle of the kick. Do better, you have enough control for it.