Brendan Rodgers and his Celtic stars were left frustrated after Alistair Johnston was punishing for a foul in the penalty box - despite appearing to win the the ball before making contact with Fabio Silva.However, IFAB rules appear to indicated why referee John Beaton and the VAR team opted to award Rangers a crucial penalty.
The Scottish Premiership leaders were in control of the showdown and held a 2-0 lead when the Rangers attacker went down in the box following a challenge from the right-back.
Whistler Beaton initially dished out a yellow card to the attacker for simulation - but he was sent to the monitor to review the decision on VAR.
That allowed James Tavernier to score and give the home side a foothold in the game as the Old Firm rivals battled out a 3-3 thriller.
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