When Arsenal beat Real Madrid 5-1 on aggregate in April, it was hailed as the moment they arrived on the elite European stage under Mikel Arteta. The then-reigning Champions League winners were brought to their knees.
Six months later the same fate fell to Diego Simeone's Atletico Madrid. European clubs are watching on with admiration and fear of Arsenal again.
The similarities between the two Madrid contests are there - Declan Rice delivering from two set-pieces being a common denominator. Arsenal deservedly winning via control, not chaos, is another.
But beating Atleti in this manner feels different. It may even be better.
This win may not have had the grand atmosphere or significance of the Real Champions League quarter-final - there is a long way to go in this season.
But Arsenal