THE lines to check whether Brentford’s goal was offside were not drawn up — and you would have to question why that did not happen.
Every goal has to be checked from every angle.
Whether it is offside, a foul in the passage of play leading up to the goal or an accidental handball by the goalscorer — the VAR has to look at all aspects.
It looked at the time that it might have been offside but, from the footage, it was not clear because the cameras did not appear as if they were parallel to the play.
That made the incident inconclusive.
Manchester City could move to within three points of the Gunners if they beat Aston Villa at Etihad Stadium on Sunday.
The two title rivals then face off on Wednesday.
After the match, boss Mikel Arteta said: “I just looked back and it is offside.
“Have they explained why it wasn’t allowed? No. It is frustrating but they will probably give an explanation later in the week. Today we haven’t got one.
“You have to apply certain principles in defending and you do that by sticking to the rules. Suddenly you change the rules and then you have to change your principles.
“So tell us before so then you don’t hold the line that high.
“Because you’re always going to have an advantage if you get blocked. You cannot block if you are offside.”