I don’t know; but a biker can be very careful, and still crash if a door opens abruptly in front of them. (Some versions indicate that the car stopped suddenly in front of the biker.)
I guess we’ll see; but if anyone is accused of being guilty of causing the accident, I believe it will be the driver.
Not by passing a car that just stopped without giving clearance for the doors. My father taught me not to pass cars that just stopped. He told me to stop behind them to see what they do next. Consider a quick "Crazy Ivan".