Originally Posted by
westdog54
Ok, first things first: there is no "third umpire system" in rugby when it comes to foul play. The referee on the field views the same footage as the TMO and makes the Final decision on what card, if any, to issue.
Second, what 'practical applications' are there to sending a player of the field for an act of foul play? Serious question.
Third, straight red cards and ejections are rare in any sport that uses them. That's not a reason for the option not to be there. As an example, there have only ever been two issued in World Cup Finals and both were entirely justified. It has only happened once in over 50 Super bowls.
Fourth, the potential for an error is not in itself as excuse not to make a change. Not by a long shot.