What happens on the field, stays on the field.
It's an old adage that nods to the fact that physical confrontation, while not encouraged, is an accepted part of rugby and rugby league and that aggressive play can often tip over into straight-out aggression.
Some players are known - even celebrated - for possessing the necessary "mongrel" to intimidate the opposition. Think former All Black Richard Loe.
I've never had a taste for it myself. It interrupts the flow of the game, has nothing to do with the sport itself and usually involves a cheap shot delivered in broken play.
To his credit, former Bay of Plenty Steamers player Simon Chisholm elected not to stay silent about what occurred on the field the day an opposition player hit him during a premier rugby match.