2019 about 10 seconds into the start of the scratch race the guy in front of us clipped his pedal and took a few of us out. My shoulder still occasionally comes out of socket... that wasn't a great weekend for a few of us on here as I remember...
Rock hill is steep and if you aren't on short cranks/speedplays, or you're going (relatively) slow and not paying attention/not used to that track, that can definitely happen.
Glad you are (relatively) alright! Now you can really claim that track
Blood soaked into the surface!