It actually resulted in.a red card for ander Herrera for SBO.. had it not rested in a red no1 would have batted an eyelid.your point is the Fergie tactic used at United, everybody, Scholes, Keane, Butt, Neville, would make their mark, not enough for a caution on its own merits, taking a shot each, pushing the ref as far as they could before the caution arrived.
I dont think you can justify cautioning an individual for persistant where it is a team accumulation, afterall, the caution report would say, that number 5 persistantly infringed, when indeed, he clearly did not if it was his first foul, making your caution technically incorrect. I would however if desperate to produce the card, make it for the tackle itself....
Am sure Oliver did that in the Chelsea United game when it was clear Hazzard was being targetted, and said enough was enough and cautioned the next offender and I recall if it matters, Keith Hacket went ballistic online in saying the offence that was cautioned was not in any way worthy of a card...
MO had clearly backed himself into a corner and couldnt get out of it.