I also cannot understand the classification of Moons challenge as a shoulder charge, it was nothing of the sort.
It was contact with the head, and a red card is effectively a subjective call based on whether you believe it was intentional or accidental. On that basis it does seem harsh to be a straight red and not yet another and much more frequently seen on report incident.
Silverwood was at least consistent in his PTB rulings last night; horribly slow, which has been a feature of his refereeing this season.
The difference in penalty counts in each half is an interesting observation, 13 penalties 1st half and 2 2nd half. Did Silverwood receive assessor instructions to referee differently after half time? It certainly worked against Leeds who would have welcomed opportunities to take the 2 second half.