Overtaking with obstacles to cross-border traffic

Hello together, can one of you tell me from when there is a barrier to the oncoming traffic while overtaking? In my case it was like this: I and my co-driver drove on Sunday two weeks ago on a country road as the last car of a total 3. The first car turned left into a dirt road. The car driving in front of me came as always no longer into the corridors and crept in front of me with about 40 km/h. Then I looked at the opposite road and had approx. 400-450m clear view to the next place I quickly overtook the car and snapped again. The only stupid thing about it was that the police came to meet me. The police immediately turned around and made a roar of blue light and siren uprising to stop me. The extremely unfriendly policeman accuses me of overtaking me with a hindrance to the back traffic, as they apparently had to slow down. But don’t understand why they had to slow down, since my opinion is that nac h there was enough distance. Anyway, today there was a fine of more than 123.50 euros and three points in Flensburg in the mailbox. I feel pretty fucked up and would like to know what I have everything for possibilities. I hope someone can help me. Thank you in advance. Greeting Matthias