After creating that simple example, I played around with conic a bit more. When first looking at it, I had not given the position of the two lines any real thought, since they are transient and go away. Since then, I have realized that playing around with creating permanent lines first, that are then used by conic, gave me better perspective on the relationships and what could be done as this animation demonstrates.
Click on .GIF to animate
The Conic values are constant (.5 & -.2). Only the vertex changes.
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