If United do not qualify from this group stage, then their collective response to two sendings off will be the main reason why.
Unlike with the collapse after Casemiro’s dismissal against Galatasaray, this time you could feel some sympathy for Ten Hag and his players.
The foul by Rashford was unintentional, his red card unfortunate and 13 minutes added on to the end of the first half left his team-mates waiting a long time for a much-needed regroup.
But what was required, both in that defeat to Galatasaray, tonight and even in the opening defeat to Bayern, was game management.
It was something that United could rely upon last season, Ten Hag recently referencing it as a key part in the Carabao Cup success, but has been seen far too rarely this term.
Instead, quickfire collapses have made qualifying from this Champions League group far harder than it needed to be. United have conceded two in five minutes at Bayern, two in 10 minutes against Galatasaray, now two in nine minutes in Copenhagen.
United showed composure to take the sting out of the Danish champions at the start of the second half, only to then give it all away again at the death. This team needs to remember how to see out difficult spells.