I'm not here to defend VAR no matter what, I've said many times there will always be incidences where they simply get it wrong - I think that will always be the case, in fact, it will always be the case.
If I had to guess, I'd say VAR looked at that and saw Welbeck going away from goal and collision not enough to warrant a penalty if the Ref didn't think it was either.... - for me, its a pen
Cucurella hair pull - not seen it, but this has been explained :
VAR cannot advise that a referee has missed a general free-kick offence in open play that doesn't lead directly to a goal or penalty. If the referee misses a foul in the lead-up to a corner, the VAR cannot tell the referee to cancel that set piece. If the team then scores from that corner, the goal cannot be disallowed. The only way the VAR can get involved in this situation is if they feel there has been a red-card offence.
Hair pulling is rare, and isn't specifically covered within the Laws of the Game so comes under either violent conduct or unsporting behaviour, depending on the specifics, though the mere act isn't an automatic dismissal. But when off the ball and with force it would be considered by most referees to be a red card.
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My turn,
can you explain to me why this wasn't a penalty ?
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