Arsenal's Calum Chambers was sent off against Stoke City as Arsenal saw a three game winning stretch come to an end.
They lost 3-2 at the Britannia, but at half-time were three goals down. A late fightback as spiked by a sending off to Calum Chambers for a second bookable offence stopped their momentum.
The teenager was playing in at centre-half in for Laurent Koscielny, and the defence missed the Frenchman's experience.
With Chambers only in his first season playing for the club, BBC pundit and former Stoke and Tottenham player Garth Crooks questioned whether he is of the right temperament to succeed at the Gunners.
He told BBC Sportsday: "He's had a torrid time, Calum Chambers. It's 3-2 and they have a chance to get back in the game, then he has let the team down and got sent off.
"On this showing, he is struggling with life in a top team in the Premier League. If you're a manager you start to ask yourself, 'can he cope with this kind of pressure?"
Crooks' comments are more than a little harsh, and show why you cannot judge a player, especially a young one, on the basis of one game.
Manager Arsene Wenger strongly objected to issuing of the red card itself. He told Arsenal's website: "It was a bad decision. If Chambers has to go off today, I can watch with you the game and I’ll find you five more players who should go."
Chambers was Arsenal's best defender in the midweek win over his former club Southampton, the difference then was he was playing at home at right-back, rather than at centre-half away in a tricky atmosphere. It's a learning experience for him and the loss and subsequent suspension will be a tough one to take, but it's no reason to write him off either.