Speaking after the game, Herrera admitted that Man United failed to match the hosts when it came to overall commitment and intensity.
And Mourinho, speaking after the game, implored Herrera to explain why he and his teammates failed to show the verve needed to claim three points in Yorkshire.
“When a player thinks that then I think all players should go to the press conference and explain why because I can’t explain.
“It concerns me of course. If it happened today then why can’t it happen tomorrow?”
This needed to happen. No Premier League campaign is without its fair share of ignominy and finger pointing, after all. Every team, no matter how complete they are, will have an afternoon where nothing seems to go right.
And make no mistake: Mourinho would have smashed a few heads together in the dressing room at full time. This was simply not good enough from start to finish.
But we will learn much more about United and their title credentials for this season by how the react to such a gloomy set-back.