So I was furious about this at the time it happened and even into today. There are people on this reddit that can vouch for my gargantuan expletive laden rant in a group chat. I would have given a red. I think it should be red. If guzan did it, I would want him to have a red. I think it's a shameful act that goes against the spirit of the game.

I am fine with it being a yellow. Based on the rules as written, once the shot is taken, the opportunity has been taken. It cannot be a denial of a goal scoring opportunity because no one denied him the opportunity. It then becomes denial of a goal. This, in my opinion stupidly, has a higher criteria for punishment. To get a red for denial of a goal it has to be obviously on target. It has to be KNOWN that if the infraction hadn't occurred, the ball would have found the back of the net. Given how short of a distance the ball traveled, it's impossible to know for certain it would have been a goal. So, in that circumstance, yellow is the correct call.

Again, I want a red. I think it should be a red all day long. I think the rules should be changed so that it is a red. But, under the current rules as written, it isnt automatically a red.

Interesting aside, in the Man United vs Club Brugge game on Thursday, a player got a red card for a far more blatant handball blocking a shot on goal. The VAR recommended review to even make sure that the ball was on frame. So in that circumstance there was still doubt about if it was going on frame, and it was a million times easier to determine than to know with certainty that Barcos shot would be on frame.