The delicate balance in north London means that when things are going badly for Arsenal, then things must be going well for Tottenham and vice versa.
Three games into the season, Nuno Espirito Santo was Manager of the Month and Spurs were looking down on the rest of the Premier League after three wins from three.
In contrast, with Arsenal pointless,#artetaout was trending and Mikel Arteta was odds on to be the first boss shown the door.
Back-to-back losses against West Ham and Vitesse only served to crank up the pressure.
The defeat signalled the end for Nuno, with the axe falling on Monday and Antonio Conte reportedly waiting in the wings.
Conte was originally thought to be eyeing the Manchester United job, believing the Tottenham project to be too big a task, something the bookies certainly appear to agree with.
For, following Saturday's loss, Spurs are now 9/1 with Planet Sport Bet to finish inside the Premier League top four, having been 5/1 going into the game.
Manchester United are 8/15 to clinch a Champions League spot, while Arsenal, up to sixth on the back of a run of five wins and two draws from their last seven, are in from 9/2 to 7/2.
But while Gunners fans are revelling in the misfortunes of their north London rivals, it is another club from the capital who are making a determined assault on the top four they should be most worried about.
David Moyes' side are now as short as 5/4 to make the top six after picking up 12 points from their last 15.
Man City are out to 11/8 from 10/11, with Liverpool unchanged at 5/2.