Before halftime, Fernando Torres was sent off for a moment of madness against Manchester City.
In a crazy end to the first 45 minutes at the Emirates Stadium, the Arsenal winger got a second yellow card.
Manager Mikel Arteta lost it on the sidelines when his team was down to 10 players.
As his backroom staff rushed to deal with the delay, he pulled his jumper over his head.
At the time, Arteta’s team was ahead 2-1 after Gabriel and Riccardo Calafiori scored goals that turned the game around.
The sad end to the half, though, was Trossard’s dismissal.
In addition, he will be suspended for next Saturday’s game at home against Leicester.
For pulling Savinho’s shirt, Michael Oliver had already given the Belgian a yellow card.
In extra time, he then hit Bernardo Silva and kicked the ball away.
Later, the Premier League revealed that the second caution was for booting the ball after the referee blew his whistle, which delayed the start of the game.
Arsenal played the whole second half with one less player, and in extra time, they finally gave up a dramatic equalizer.
The winners saved a point when John Stones pushed the ball over the line in the 98th minute.
Declan Rice was sent off for the same thing last month against Brighton.
Rice was kicked off because he blocked Joel Veltman’s shot from the free kick for the Seagulls.
That was only Trossard’s second red card in his senior career.
He has also been fired for the first time since 2015 when he played for Lommel in the second level of Belgian football.
He moved from Brighton to Arsenal in January 2023 and has scored 19 goals in 73 games since then.
Just one of those goals, in August’s win over Aston Villa, has been his only one this season.
Even though Arteta got a red card, he still hugged Trossard as he walked off the pitch to show his support for his partner.