How do you go from total perfection to utter disaster in 18 minutes? You can ask Manchester City and Pep Guardiola, but even they won't have the answer.
The visitors looked like they were on cloud nine in the 73rd minute of the game at the Bernabeu and on their way to the Champions League final in Paris when Riyad Mahrez swept home at the near post after Bernardo Silva had lead a surging City breakaway.
They had held firm for most of the game in a fiery atmosphere away from home, against a side who failed to have a shot on target until the 90th minute.