So we were at mile 63 in a century. We were starting up after a rest stop. There was a guy beside us starting up. All of a sudden he falls over knocks our bike over (we were still standing over it) and lands on our back wheel.
He managed to bend the disc brake rotor. I was able to true up the wheel. The rear derailleur was scratched up and looks a little bent but appears to shift fine. Because of the rotor we had to sag back to our car. Maybe we should carry an extra rotor?