I haven't done it, but it kind of makes sense. If you drop a stitch, it unravels and leaves horizontal bars behind in it's path. This instruction says to purposefully let the stitch drop, but only for 4 rows--you'll have 4 horizontal bars of yarn.
Before it goes any further, I'd grab it with a crochet hook from the back and bring it up behind the bars and put it on the left needle and knit it from there. That sounds easier to me than using the right needle, but you might want to try it.