My high school experience
I was one of the yearbook phtographers, so I went to many high school football games. The occasional hard hit but never more than a minute on the field, and then a walk it off. Our school played rugby against the other shools in the district but it was pretty tame too.
Then we had a exchange with a school in Wales, and the rugby teams met up. Four of our players lost consciousness, and one had a broken collarbone. And this was with a team that was staying in our players homes for the duration of their stay. Imagine if they were archrivals.