Rambling rows afghan help

on the rectangle in the rambling rows pattern the end of rectangle row is confusing to me.
the instructions are:

when you have 4 stitches left.
Slip first stitch *knit the next stitch, then PSSO. repeat from *

but if I knit one the psso, then knit the next stitch, there is no Slp stitch to pass over. on the previous knitted stitch.

This does not make for a very nice ending. It is sloppy.

Does anyone have a more sleek finish to this rectangle

thanks
susan

Slip 1 st, knit 2, pass slip st over. Then knit another and slip the loop from the previous stitch over it. It sounds like a BO at the end of a row.