Ruben Amorim got a taste of how tough it can be to be Man United head coach in the Premier League clash against Arsenal.

In the second half, two goals from corners undid the defensive solidity that the coach had put up for his team.

That is the lineup of Gunners players who pack the opponent six-yard box, run in from behind the back post whenever they win a corner, and score goals often.

After William Saliba’s goal, the cameras found Amorim looking completely dejected in the dugout.

He had his arms on his hands, looking agitated and worried after seeing the game basically gone out of his side’s reach.

Ruben Amorim suffered his first defeat as Manchester United boss

Amorim’s side barely had a shot on goal until a David Raya wonder save denied Matthijs De Ligt midway through the second half.

But the corner count of 13-0 told its own story. You simply cannot afford to afford Arsenal so many set-piece chances when they are the undoubted masters of that art.