Chelsea supporters were forced to watch their side absolutely dominated tonight as they lost in the Premier League to one of their fiercest rivals. The Blues were beaten 5-0 by Arsenal away from home, putting a real dent in their already fading hopes at qualifying for Europe at the end of this season. The rout started just three minutes in, however the embarrasing damage was done after half-time to pile more misery on manager Mauricio Pochettino. While blame was put at his door for the first goal, a lot can be said about the display of Djordje Petrovic, which says a lot for a game that finishe…