Getty ImagesSoham MukherjeeExplained: Why Arsenal boss Mikel Arteta isn't on the touchline against Aston VillaArsenalM. ArtetaAston Villa vs ArsenalAston VillaPremier LeagueArsenal boss Mikel Arteta isn't on the touchline against Aston Villa after his wild celebrations in the dramatic victory over Luton Town.Article continues belowArticle continues belowArticle continues belowArsenal beat Luton in stoppage timeA late winner from Declan Rice sparked massive celebrationsArteta was yellow-carded for his over-the-top reactionsArticle continues below