Yeah, one of the least-logic aspect of the sin-bin protocols for me. Everyone and their dog knows what a red card means - that player can no longer participate and his team now play the rest of the game a man short. In the situations described by @Eddie , @Gamespoiler and others above, it would make so much more sense for the protocols to require a red card at that point (and for any other details such as where the player can go, to match up with what we're all used to from a red card)
As it is, no-one quite knows what's happened and you get a complex mess of results.
The difficulty is the sheer amount of communication needed in some circumstances, which wouldn't be needed should we have the capability of showing a red card.
For example, 1 yellow for USB and 2 dissent yellows = cannot return and cannot be replaced. I very much doubt either of the 2 coaching teams or sets of players will know whats going on once you've shown that 3rd yellow. You've got to explain it all to both sets of coaches and then deal with all the questions from the players. You could ignore them but I suspect you'll get both teams just genuinely wanting to know whats going on because they've never seen this before.
A red card following the 3rd yellow and everyone knows instantly and you've not got several minutes of confusement to sort.
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