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The check by video assistant Michael Salisbury took a couple of minutes to complete before the on-field decision of offside was confirmed.
During the check, home fans inside the London Stadium became increasingly frustrated by the length of time taken to confirm the decision.
Those frustrations were echoed in the commentary gantry with McCoist and Darren Fletcher.
TNT Sports was broadcasting the game, and co-commentator McCoist expressed his irritation with the amount of time taken by VAR to check the offside.
"You can hear the fans' frustration," said McCoist on TNT Sports.
Two minutes that took."
McCoist then explained why the fans had every right to be irritated by the time that was taken by VAR to judge the offside call.
"It's not on.
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