we goofed! the nathan pattern has been amended and the errata is shown below:
Drop a stitch marker at the mid point of the row, i.e. slip 22 (26, 30, 34, 38) sts, drop stitch marker and then slip the stitches back to left-hand needle.
Row 1 (RS): K until last 4 sts before stitch marker, then K2tog, K2.