[tongzilla]

Answer in bold.

If one is observing the clubhead "blur" of the arc of approach, should one see the clubhead , after impact, continue travelling down and out , BEYOND the plane line, out to the low point line ?

Yes.

In other words, the farthest OUT the clubhead travels is out to the low point line, not the plane line?

Yes.

If the farthest outward point the clubhead reaches is the plane line , just before travelling up and in, wouldn't the plane line be bent and cause the outside in divots?

You've got it wrong here, see my notes below. If in doubt, the Straight Plane Line is never ever bent. As long as ball is placed before Low Point, divot points to the right. The further before Low Point, the more right the direction of divot points. Impact is always inside out, but the Stroke isn't. Study 2-J-2.

If one is using the roof analogy( I hope I remembered this correctly), it's late autumn, the low point line is the gutter, the plane line is outermost edge of the shingles, and one sweeps the leaves in the gutter.

I hope I am not completely lost.

Remember than the Impact Point Plane Line and the Low Point Plane Line are horizontal lines inscribed on the face of the Inclined Plane. They are parallel to each other. Always keep in my this model in your head. It clears up a lot of confusion. That's why Homer included 1-L. Because the Inclined Plane is inclined, the Low Point Plane line is further out (keeping in mind my previous post ).