The Boleyn Ground was buzzing and bubbles were floating all around the stadium as West Ham fans celebrated Manuel Lanzini's composed opener.
Then James McCarthy went sliding in from behind on Dimitri Payet and the bubbles were burst. While Payet tried to carry on, he eventually hobbled off early in the second half and it was confirmed that he would be out for three months.
His manager, Slaven Bilic, said that he did not see the tackle but he was unhappy with the injury and James McCarthy should have been shown red rather than yellow.
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Bilic's displeasure at the injury is hardly surprising. Payet has arguably been the signing of the season since joining the Hammers from French club Marseille in a deal worth £10.7m.
He has been involved in 35% of West Ham's goals, leads their scoring charts, with five in the league, and has completed more dribbles than any of his team-mates as well.
Payet has created a whopping 47 chances, which is no surprise as to why West Ham currently sit 6th in the league.
This total is also more than Aaron Cresswell(16), Mark Noble(11), Cheikhou Kouyate(10) and Manuel Lanzini(9) combined, and more than anyone in the league aside from Arsenal's Mesut Ozil.
The 28-year-old has made such an impact that in October he was nominated for the PFA Fans' Player of the Month award, missing out only to Alexis Sanchez.
His injury presents Bilic with a sizeable problem as his replacement during the Everton game, Enner Valencia, was also injured in the same game.
Payet's natural replacement would be Manuel Lanzini, however, he could use this opportunity as a chance to experiment with other players in the squad such as a Caroll/Sakho partnership in a two-striker formation or Carroll as a lone striker with Sakho on the right.
During Payet's absence Bilic will need to find a solution to ensure the Hammers' bubble hasn't burst by the time he returns.
West Ham fans: Can Dimitri Payet be replaced while he is on the sidelines? Have your say in the comments section below!