The England-Argentina match was conclusive proof that some alternative should be found for a team playing with a man short when a player is red-carded.
England, playing impressive rugby at times interspersed with weaknesses that other top sides like the All Blacks, the Springboks, Wales and England will aim to exploit, had to work hard in the first 17 minutes to keep Argentina at bay.
Then came another hot-headed moment from the serial offender Thomas Lavanini who ironically hit another of his kind, England captain Owen Farrell, high with his shoulder.
The game as a contest ended right there despite spirited but predictable futile resistance by the South Americans.
There have been trials at lower levels of the game where red-carded players were replaced by a teammate after a specific period, having the effect of a yellow with a new player coming on after the period for the transgression has expired.
Argentina, needing a win from the match, gave as good as they got until the banishment of Lavanini and kept England scoreless until shortly before halftime with the score still at 5-3.
Then England used their extra man to put the match to bed with five of their six tries coming in the 45 minutes from shortly before the break.
England looked good on the run against the 14 opponents, handled rather poorly although the humidity could perhaps be blamed, lost two lineouts to the Pumas whose one lock was off the field and were never tested by an effective or rush defence.
England (15) 39: Tries: Jonny May, Elliot Daly, Ben Youngs, George Ford, Jack Nowell, Luke Cowan-Dickie. Conversions: Owen Farrell (3). Penalty: Farrell.
Argentina (3) 10: Try: Matias Moroni. Conversion: Emiliano Boffelli. Penalty: Benjamin Urdapilleta.