Red late tackles white, white punches red, if that was all that happened, then straight forward white pen, reversed to red.however players from both sides then trade blows, all worthy of at least yellow.Ref decides to card the original 2 offenders plus a yellow for one more player from each side, but does he still award penalty ,if so to whom, or do you award a scrum, if so to whom and where would the mark be bearing in mind that white had advanced 30 m forward before the ref had to stop play.