[Yoda]

Question 1.
Am I still supposed to swivel if I'm using a vertical hinge?
It seems harder to do the swivel if you use a vertical hinge or even an angled hinge.

Question 2.
I just want to confirm: in the hinge action related only from impact to followthrough? Do all three hinge actions come into the ball the same way?

Re #1:

If the length of Stroke exceeds the Follow-Through, then you need a 'bridge' to the Finish. Ideally, that bridge is the Finish Swivel. However, the Vertical Hinge Action (with its Layback Only Motion of the Clubface) is usually restricted to the Short Shots, and most players simply allow momentum to carry the Stroke to its abbreviated Finish.

And yes, it takes some effort to execute the Finish Swivel when using Vertical Hinging. That's because Vertical Hinge Action's Reverse Roll Feel -- an actual 'backward' (clockwise) motion of the Wrists -- must be followed by the counter-clockwise Swivel of the Wrists to the Plane.

Re #2:

Yes...The Hinge Action is executed between Impact and Follow-Through (the Both Arms Straight Position). The Left Wrist is vertical-to-the-ground, i.e. perpendicular to the Horizontal Plane, at Impact for all three Hinge Actions.