Semenenko hit his head on the ice while performing a quadruple jump.
The 18-year-old figure skater tried several times to get up off the ice and continue his performance.
Having risen to his feet, he was lost in space and went outside the rink, finding himself on the podium with the audience.
The first aid to the athlete was provided by his coach Alexei Mishin, as well as Svetlana Sokolovskaya and Plushenko.
Later, Semenenko was taken off the ice on a stretcher to the applause of the audience.
The show continued.
Semenenko is the winner of the 2021 World Team Championship.
The 18-year-old figure skater was taken to the 17th city hospital.
Doctors do not rule out a craniocerebral injury in the athlete.
Earlier, Maria Butyrskaya said that it is much more difficult to make complex elements at ice shows.