@Fullycaffeinated @FeartnTired If you can find the dropped stitch, you should be able to pick it up and re-knit it using a crochet hook. No pulling back required.

I don't think I can describe the process very well verbally, so I'll try and find a video...

You can ignore Feart's advice on this occasion. Dick stretching is not a usual part of the sock making process!