This is interesting......
And some of the red cards are for instantaneous things where the player had no thinking time at all, and are not the result of doing something "dumb", including the one that sparked this discussion (even if it was later rescinded).
I've seen the argument made that what is needed is a sea-change in attitudes in rugby to minimise the risk of head injuries and that the Steward example is a case in point.
It's not the split seconds before impact that are the problem but the seconds before those. Something specifically for players in those positions who may be running onto a contested loose ball from a distance at pace, notably full backs and wingers.
I'm not sure about such an argument but writing the event off as something that couldn't be helped or describing it as a part of the game is something that is going to ultimately damage and possibly kill off the game. (never mind the players). Not today. But someday.
Things need to be tried, tested, tweaked and World Rugby is doing that. It's not a perfect process.
As for the bolded part, Peyper told Steward on the day that he turned into Keenan, something fairly clear on the replays so there was time to turn, even if only enough time to do it by instinct rather than thought.
Rugby players will need to "train out" that type of instinct.