's advice, as I often do. She is good about considering a horse in the WHOLE, not just the parts.
Your first post, OP, is a bit confusing. What happened that the horse dragged you? REally think about what the horse does well, and what he struggles with and think about what are the FUNDAMENTAL differences between those two things, from teh horse's perspective.
One of the things you will want to get this horse to become able to do is to move his fore quarters away from you. The way that he keeps facing you, no matter what, is expected from a horse that has had a boatload of whipping or driving from behind. He faces you because that keeps you from being able to get into a 'driving' position.
Ok. he is worried about being driven. so, . . . don't drive him for a bit.
you get him out onto the circle by moving his shoulder out there, which is a little bit of driving, but is not pushing hard on his hindquarters.
you face this horse, who is facing you, and you lift the lead line and kind of 'point' out toward the wall, in the direction you envision his first footfall should be. this wil be his front, outside foot, which should rreach forward, and outward, toward th outside of your circle.
So, with the leadline telling hime where to step, you put some pressure on his face. this is asking him to follow the indication of the leadline, and step outward, away from you. you approach the horse, with your hand 'air tapping' on his nose, specifically on his inside nostril (by inside, I mean if you are asking him to step to your left, his right, outward toward the imaginary circle, then you push on his left nostril. I know, it's complex to explain in print . . but . . ).
he will eventually step away from your pressure, and follow the indication you have on your leadline to step to his own right, toward the circle.
hurrah! he moved his shoulders away from you!!!!! this is huge!
reward him by stopping the asking . just let your body go slack, and let him stand or even if he comes back to facing you, it doesn't matter, he did what you asked.
again, use your leading hand to sort of indicate the angle you want him to step out toward, and focussing on his inside nostril, you 'tap' the air toward him, and step toward him and you WATCH for him to respond.
if he is really dull, or resistant, or confused, you will be air tapping, and stepping toward him and you may end up literally 'running into ' his nostril with your tapping fingers, THAT shoudl make him step over and away from you. Again, reward this by complete cessation of the pressure.
do you see ? first you traiin him to step out and away from you, THEN you use that leading hand, which is still holding hte leadline, to suggest to him that now that he is not longer facing you, but is alinged on the circle, that he walk forward. you back this up with a littel bit of driving on his driveline.
This is a univers of gobbledygook words for something that I could show you in 10 minutes! I wish I could step through cyber space and help you. But, I know you'll figure it out.
I truly wish you the best, and hope you'll forgive my terribel typing!