Offside is objective not subjective, the rules are there in black and white and there is no grey area
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Rashford was offside - confirmed by replays and the lineman flag.
He was interfering with play - shielding the ball by continuing to run between Akanji and the ball, thus preventing Akanji gaining possession. The lying bastard even tried to claim he stopped running when interviewed!
He gained an advantage - shielding the ball, stopping Akanji and Ederson getting to the ball by continuing his run, distracting Akanji, Ederson and possibly Walker.
His actions were an obvious action which clearly impacts the ability of an opponent to play the ball - dummying to shoot, shielding the ball from Akanji which stopped him getting to it and running towards goal which stopped Ederson coming out and gaining possession.
Ederson wouldn't know if he was offside or not, Akanji suspected he was offside but played to the whistle and knew he would be penalised regardless if he committed a foul meaning all he could do was follow Rashford (who stopped Akanji gaining possession from an offside position)
The linesman delayed his flag as instructed then raised it at the end of the phase as he knew it was offside.
The problem was Attwell failing to apply the laws, took him literally seconds to over rule his linesman despite being well away from the action.