Am I understanding this quote correctly that when employing vertical hinging the clubface loft is increasing from impact to separation?
JG
Yes. Vertical Hinging is layback with no closing. Continuously. Although the collision does wreak havoc upon the underlying geometry and obscures things. The ball hits the face as hard as the face hits the ball.
Reverse it for horizontal .....closing only no layback. Two extremes. Two different ball responses. I do believe it effects ball response. Though the interval is short the dynamics are still present, you'd have to get impact to 0 seconds for it to not have an effect. Sort of like what part of curve is straight or ....