You are in the poing marked as A and you have to turn in C point , a car is standing by the B point waiting for you.
You start turning because the lane at your left is free, but you can't see behing the guy on B since the car is blocking the view.
When you almost hit the C lane a car overtake you from the right at over 100kmh, whitout even touching you but very close (you must imagine the sound of the wheels skidding on the road).
So... who's fault?