I’ve noticed when looking at some fonts that the S often has two nodes on a path across the length of the diagonal. These nodes appear to be linked in some way. When I drag one around, it doesn’t behave like a normal node and the path extends in a direct line to the other “linked” node. They are both curve nodes but the line between them is always straight. I have a short clip of the behavior here.
How can I get nodes to behave in this way? I’ve searched the forum and manual and can’t seem to find any mention of this behavior.