I'd be happy to clarify.

He is spinning on the ball of his left foot, which has been his lead foot the whole time.  My apologies for not clarifying. Since the staff is in his left hand I pictured him sweeping the staff behind him as he spun. The staff remains vertical during the entire movement and still fairly close to his body, the end not far away from his left foot.  

The staff isn't actually a block against the weapon, Ryuku's spin removed him from that danger. The purpose of the staff is to be placed there as a barrier, so that she just can't spin and swipe the blade at him. 

Since you didn't clarify which side of her body the stab came from I wasn't exactly which way to spin. 

The end result of his movement would be spinning out of the way while setting up a barrier to her blade, and striking out at the side of her head from her right and behind.

Hopefully that clears things up.