Phil Dawkes, BBC Sport
Manchester United seem determined to put themselves and their supporters through an emotional wringer this season.
You would forgive most for believing their worst start to a campaign in six decades, culminating with back-to-back 3-0 home losses to Manchester City and Newcastle, would be the nadir.
Little did we know of the drama to come.
When the dust settles, it will be the period after half-time and the matching one in the first half Ten Hag will likely draw on to show his battered and bruised side are indeed making progress, albeit slowly.
Ultimately though, with such little wiggle room following their early-season travails, results are key for United now, and again one eluded them here.
The instinct to retreat to their own box was understandable in the circumstances, but the defending when they got there for Copenhagen's leveller and winning goal left a lot to be desired.
In contrast to United's 1-0 win at Old Trafford two weeks ago, it was the Danes dancing deliriously after a late show of strength.
They are now second in the group, leaving United with it all to do to keep their Champions League hopes alive.