I may have shouted for a red, and the ref would have produced a yellow or no card at all if it was against the RS at their place. That tackle is not dangerous and happens on a weekly basis and probably happened in another few games this week without being red, it’s a boarder line foul some would give it others wouldn’t. It’s a grey area same as handball being intentional, the refs opinion counts and they can be influenced by teams, players , the players involved etc. that tackle will happen 200 times over the corse of the season and not be punished by a booking imo