Car accident… who is to blame and who pays?

Hello, the day before yesterday 25.12 on the way to the club(Not far away from where I live about 1.5 km) drove in front of me on the (30-zone) road a car with 3 occupants(The driver middle 30 is not the holder of the vehicle..but according to accident report his father),which suddenly became slower about 25Km/hour and quickly left in a driveway Small plot without blinking. He wanted to turn Since it was a non-domestic license plate, I went from that he had an address s ucht or…I drive behind him I thought he wanted to stop suddenly at this moment the driver tore the steering wheel around and left in a driveway (lot). Despite immediate braking and trying to hit left to the left wheel I drove the car into the rear door with it, not in the middle but with the edge of my car-wing pole.The damage with me is small, but with the other one the rear door is completely damaged.The accident was on my Verla ngen received police. The approach was also confirmed by the opposite side, only that this suddenly claimed that he had flashed. I do not realize, possibly to get a debt, for which I can absolutely nothing. I had to pay 35Euro. I called the insurance of the opponent today and reported the accident, the opponent did not report his insurance yet the accident means the lady. The nice lady asks me at the end what is damaged in my car, I said r Damage is low-wheel run is torn down, the bumper is torn down sideways and the Little Fog Light is hooded (see pictures). The lady offers me an expert from DEKRA to order without cost if I want and if I want to other expert I have to pay myself. The lady has confirmed the order and next week the expert reports to me to make an appointment: Do I have to pay the expert?(According to the lady, I don’t need to pay anything?!) Thank you.