Rangers won their big derby game. Arsenal did the same this past month, only for their form to subsequently plummet.
Glasgow Rangers secured their biggest win of the season as they finally beat rivals Celtic.
It ended a run of 12 matches against Celtic without a victory, and it has come as a huge boost for new boss Steven Gerrard.
Rangers' players, staff, and fans are all enjoying the moment, and understandably so.
Where Rangers need to be careful, is how they follow this up.
The pitfalls of a post-derby reaction are highlighted by Arsenal's implosion in form in the English Premier League.
Arsenal beat Spurs in early December, at the peak of a 20 game unbeaten run.
It was suggested as a significant moment for Arsenal, a potential tipping in the balance of power after finishing below Tottenham for two seasons in a row.
Since then, Arsenal have gained only four points out of a possible 12 in the league, been knocked out of the League Cup, and lost their last game 5-1 to Liverpool.
The big moment against Spurs proved to be a false dawn.
Rangers now have a break before the league resumes and can try not to get swept up in the exhuberance of their victory.
To make it count, they still need to hit form, and make the most of the opportunity they have given themselves.
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