That's a pointless hypothetical though, because if he is given the yellow for challenge #1 it's fair to assume we change our tactic, or at least Folau is more cautious with his challenges.
I don't disagree that the first challenge deserved a yellow, but to then say in hindsight it should have ended in a red isn't necessarily correct.
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We did change our tactics. After Folau's yellow card we didn't do another kick off where he competed for it until the dying minutes after Ireland went ahead by 4 points and we were going for our last roll of the dice.