My second thought was, how could the motorcycle rider who saw it happen not have stopped to try and help, as there was no one else in sight. Might be unreasonable of me, but I couldn't just have driven on by whatever my brief might have been.
Did they? The filming just seemed to continue.
Yes, stopped and jumped off, the coverage continued with the bike behind the american coming through.
I found this whilst looking at other Olympic videos, and is of the accident from a different viewpoint. I apologise for posting this, (it is in the form of a link at the bottom
so you don't have to see it if you don't want too).
Just after the crash there was a person seen running towards her, now we know who it was (a spectator, and poster of the video below), but as for the motorcyclists.....
The race officials didn't stop there and then, she was actually left lying there for almost 2 minutes before medical treatment arrived!!
I know it is unreasonable to expect help so quickly, but jeezo, it must have felt like an eternity to the spectator, and answers your questions.
The spectator wasn't much help either, they just stand there filming, which is kinda' disrespectful, but then, unless you are a doctor or paramedic, what can you do really other than flag down help? The last thing you want to do is move anyone!
The screech of those car tires at 1.06 before the rider arrives says it all.
Sorry, but we now know she is in safe hands, and you see her starting to move slightly near the end, but I will admit though that when I saw she wasn't moving after the crash.....
.
Video here, click or ignore, you choose, but for pities sake don't just click on it to deliberately be offended!:
View: https://youtu.be/eyxgToqzKR0