I agree with Hugh. The tackle was a bit high and there didn't seem to be an effort to wrap. I looked twice at the video, and it seemed the arm was aimed right at the winger's head. Now when I played I got high tackled at times, because I'm 5'8" (was, now I'm about an inch shorter). I don't recall a lot of penalties called for it, and I never complained. As a ref now I try to be careful making a call for a high tackle. I just did a game Saturday (women's match) and there were some tackles made around just below collar-bone high that I let go. A few inches higher, as in an arm aimed above the base of the neck, and I'm blowing up for a penalty or giving advantage to play on, unless there's an obvious injury.
A law change that could mean more lineouts, where there rarely is injury, and less running, in which the chances of a tackle and concussion exist, is to return to the old kick into touch rules that existed from the time that the Australian Dispensation rule became a general rule (1968) until some six or seven years back when kicking into touch directly became more restrictive.
Incidents like this one aren't all that common in rugby. It's usually the responsibility of the weak side wing to run up field on kicks into the box. Now why a big lock forward was playing back is another question, but this is just a short clip of the game. »