The following match situation belongs to the category Severity of Offences.
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The offender fouls his opponent with high intensity, exceeding the necessary use of force. He clearly endangers the safety of his opponent. He has only relatively small chances to play the ball, which was however still close enough to not fulfill the criteria for a violent conduct.
A tackle that clearly endangers the safety of an opponent must be sanctioned as serious foul play as defined by Law 12.
The referee correctly sent the offender off with a red card.
To trigger further room for discussion: Was the card-showing procedure satisfying? The referee raised the red card without much hesitation with the offender still lying on the turf. Usually, you should NOT show cards to players that are still on the ground as it does not show sufficient respect.
However, in this concrete situation, a quick decision that calms down the furious crowd as well as the heated blue-dressed players and, at the same time, diffuses any room for potential protest justifies this procedure to a certain extent.