Re: Bokken and Jo questions
It could be, as in many cases, the flick at the apex or contact point is a natural correction of posture after the extension of the cut. A release, if you will, of the body weight returning to natural posture. The elbows being on the hips make this correction as they begin to move back into position at the centre. To my knowledge the wrists stay pretty well strait. If you focus more on the elbow/hip/posture position, it will tell you.
All the best, John.