DAA, you aren't a journalist for The Daily Mail by any chance?
Of what I saw, a York player and a Brid player had a scuffle on the floor, Brid players (cause they were closer) then "piled" in, 2 seconds later York players joined in (as they were further away). Handbags were thrown and the "mass brawl" was over within a few seconds. Captains pulled to one side, no cards shown and play was restarted with a scrum. No further incident in the game.
Although, after the game, it was alleged that the York assistant coach, a Championship player, wanted to take things further with one of the Brid players. I am not entirely sure on the full story of that and whether it is just a few exchanged words but if I was a Daily Mail Journalist I am sure I could think of something to exaggerate it.
So yeah...mass brawl.