Ireland eventually pulled away in the last quarter to win 32-15 as the disadvantage of being a man down caught up with England.
Many pundits argue a red card is often too harsh a punishment and ruins a game as a spectacle, but others believe the 20-minute red is an insufficient sanction for serious foul play.
Ewels saw red as part of World Rugby’s determination to stamp out head-high challenges, with the global governing body eager to lower tackle heights in response to concerns about the long-term health impacts of concussion on players.
The Super Rugby trial, however, has so far proved inconclusive.
“It would be great if more competitions, even in a closed trial, would use it because that would give us more of an overview of the effect it would have on the game.”
Gilpin added: “We need to see more of the data to see whether that strikes the balance between safety and spectacle better.
“There is more work to do to analyse that and the concern is, if a team goes back to 15 players, is that enough of a deterrent to drive that behavioural change?
“We would like to see it trialled more widely before drawing any conclusions.”
No red card rule will enforced until after 2023 Rugby World Cup
The 20-minute red card can be trialled by individual competitions, as is the case in Super Rugby, but cannot be considered for global adoption before the next women’s (later this year) and men’s (2023) Rugby World Cups.
The 20-minute red card failed to gain World Rugby support when global trials were considered back in May 2021, but dispensation was given to any competition wanting to implement the rule as a closed trial.
By Garrin Lambley © Agence France-Presse