To the Back

If you want to get to the back in the broadest sense, you have two options. You can get behind the knees, or you can get behind the elbows. A berimbolo would be an example of getting to the back behind the knees, and an arm drag would be an example of getting behind the elbows. There are only four ways to get behind someone, which should direct your course of action if you want to take the back. Through the legs, around either side, or over the head, and whatever path you take as long as you achieve the desired result is valid. Focus on what you are trying to do not a picture-perfect way to do it.