I know, almost a silly question; You get hurt!

I'm looking for accounts of people who have been hit on tour. If I'm on the shoulder, and someone gets too close, and their mirror or the side of their car nicks my pannier or my pedal, am I going to just go down immediately face first? Am I more likely to ricochet off but remain upright?

Is there realistically anything I can do in the seconds before getting hit to reduce injury or bicycle damage, and relatedly, should I take my backup bike and practice jumping off of it while riding?