[tongzilla]

Here is another way to look at things, which should be read in conjunction with MikeO's well explained post.

Angled Hinging produces a clubface motion which goes from closed to open relative to the plane or clubhead line of flight (hence the slicing tendency), even though the clubface goes from open to closed relative to the target line.

One way to show this is if you take a club about two feet back using Angled Hinging (no roll feel), and then move your arms and club together as one unit to a horizontal plane (e.g. table) without disrupting any alignments, the clubface is closed.

Now take the club about two feet through the ball using Angled Hinging, and move your arms and club to the horizontal plane again without disrupting any alignments, the clubface is opened.

Note that the clubface closes at a slower rate compared with Horizontal Hinging. The center around which the clubface rotates around is different to that of the clubhead.