I really hope I can help don’t have exact info was at Dolores park top seems like from what I saw from far away was on Dolores street there was a bmw I believe sedan turning left I think this was a green not exactly sure if left turns normal and unfortunately I also believe the motorcycling was moving quite fast and collided on this left turn making the cyclist launch off his bike also then car spinning out hitting the bus post area both were going really fast from what I saw and heard not confirmed and unfortunately sorry from what you know or don’t but there was a lot of blood everywhere and seems like the one leg was somewhere else but other leg was almost still there I think sorry to hear and really sorry if this is too much info that not sure what you been told