People react strangely in moments of stress. Probably nothing more. If she was a conspirator, why would she place herself in the line of fire?
This. If you have never trained for stress, you have no idea what your reaction will be. Fight, flight, freeze? For many its just disbelief of what is occurring directly in front of them. And so many have been self trained to just pull out their phone and start recording, no regard for the truck thats about to run them over.