There is a reason that bike riders don't push their bikes on public roads the way they would at the track. For one thing, a track is more likely to be maintained. So while it's possible a rider will find debris on a race track, they are less likely to encounter loose gravel. The owner of this Honda CBR1000RR Fireblade learned this lesson through experience. He brakes while approaching some gravel mid-turn, loses control of the bike and gets thrown to the grass on the other side of the street.

The second bike rider posted the video to show other riders what not to do in this situation.