In this video I show an escape from the backstep position where your opponent has really twisted your body and pulled on your knees.
There are a few really good escapes from the back step but when your knees are pulled it can really limit your options.
I would not recommend using this as your go to escape as it exposes your back. But if your knees are pulled and you cant do a knee switch or leg lift this is an excellent option (and my go to option).
Keep in mind that this is a neutral position when you come up on your knees and that the only thing that will save you from having your back taken is the belt grip.
In the event that you are a no gi grappler this can be a good move if you have faith in your back taking skills but I don't recommend making it an important part of your defensive strategy because if your opponent knows it's coming they may be able to out time you.