Dude, that sucks. But as I said in my other post, the whole business sounded bizarre. Maybe you're best out of it. It looks as if Germany is full of nice warmbloods so you will hopefully find something else soon.
There's a lot to be said for a straightforward transaction. Someone wants to find their horse a nice home, you are a nice home, done. There were funky, complicated politics surrounding our purchase of my very first horse and while I got the horse, it was just rubbish, really, and if we'd been psychic and known it was going to go like that, my parents (I was 13) probably would have insisted that we keep looking. In that case, the horse was sold to us from underneath someone else, but we were not aware of this until it was too late. I remember well that my mother, who is a very ethical, above-board person, was raging when she found out what the seller had done. On the other hand, the next two horses down the line were a piece of cake to buy -- their sellers were honest and straight-dealing -- and reaffirmed my view that if it seems fishy, run away, because buying a horse doesn't have to be a stressful, horrible morass.