The error that led to Serge Gnabry’s equaliser changed the game and helped end notions Arsenal might pull off their own 5-1 win

It wasn’t supposed to be this hard. In the opening 15 minutes, it didn’t look as though it was going to be this hard. In the end, it could have been a lot worse for Arsenal and a draw still gives them a reasonable chance of progression to the semi-final. They did have the wherewithal to find an equaliser. They got away with it. But the bigger issue is how they allowed a game they were dominating to slip from their grasp.

A penalty shootout win against Porto was evidently not enough to banish Arsenal’s European demons. But those demons are perhaps not confined to the Champions League. This has been a highly impressive season for them, a clear improvement on last year. But one doubt remains: when the going is good, Arsenal are very, very good, but what happens when things go awry?