From watching the replay of it
by wcnitz (2017-09-14 09:05:41)

In reply to: Auba offsides: I've watched it over and over  posted by spade


The retreating offside player did not impact the defender closest to Aubameyang. He just got beat.

So it was definitely a poor call. That said, considering the volume of offside attackers here it is extremely difficult to track that correctly. The linesman is opposite side, Aubameyang is behind other players and I think he made this call believing that Auba was one of the players that started in an offside position. Just screams out the need for VAR and to let the attack 'finish' before blowing the whistle when the flag is up.