Insert right needle straight through both stitches on the left needle and wrap yarn from back to front (so the right leg of the new stitch will lie in the back)...
...draw through both stitches on left needle...
...and move the first stitch on the left needle over to the right.
The new stitch lies on the right, the older stitch on the left.
View from the back - you can see how the stitches sort of cross over each other on the needle.
Insert left needle through both stitches on right needle.
Wrap yarn from back to front around right needle, pull through both stitches...
... and transfer first stitch on left needle to right, dropping the second stitch off the needles.
Then transfer both stitches to the left needle.
The result after one more regular row: after the return row, the stitches that were worked in the return row are twisted...I got to this page from Eukaryote Writes Blog and was surprised to see that this post was from 2015. I recently purchased out of deep curiosity (and was a little disappointed upon receipt) a book called Distitch, by Assia Brill. (You can see previews of it here: https://assiabrill.com/knitting-2/distitch/) It's basically a rediscovery of what I've now learned (from a review: https://www.youtube.com/watch?v=mqNkC0x26aQ (see description, specifically the Archeological Textiles Review links)) is called "compound knitting", specifically "two-course". Brill's book includes the two-course versions of many knitting techniques, not only purl but also brioche, starting and resolving a two-course section inside a field of plain knitting, and increases and decreases.
What's so interesting to me was that both Brill and I couldn't find any mentions of this technique anywhere -- though she may (or may not!) have been motivated to claim novelty, I was motivated to not feel the need to buy a $40 book. Part of this was likely because we didn't know what keywords to search, and another part is that it seems to legitimately not be very popular -- though as the archaeological textile community will attest, much of the time we don't even know what we're looking at, much less whether it's popular. Having used the Distitch selvedge technique, I will attest that it is fiddlier and more interesting than simple knitting.
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