Alexander Bolshunov won the men's mass start in superior style.
It then looked like there would be three Russians on the rake behind him, but a fall in the end destroyed that plan.
Alexei Chervotkin and Yevgeny Belov fell just before the riot.
They became annoyed with each other after the crash.
Chervotkin was dished out and Belov finished eighth.
Avoid the crash
The Russian Ivan Yakimushkin managed to avoid the crash and finished third.
Dario Cologna finished second.
The best Swede was Oskar Svensson in sixth place, he is now third in the overall summary.