IRB - NO NO NO and NO.
This incident and allowing Smith to return after a 5 minute test, as specificed by the IRB for Elite Rugby, is wrong for Elite levels and any other level too.
A concussion can be very serious (and has been fatal) and needs careful treatment - having been there twice myself many years ago, I am forever thankful to the two blazers who stopped me from going back on (neither was a medical doctor). I dread to think of the one time I did return v Wasps in a very physical match and what might have happened - to this day I have no recollection of the match, or a few hours later being taken to Addenbrookes having thrown up in the Hawks Club afterwards drinking just water. I was kept in hospital for 48 hours observation.
Good article by Peter Fitz
here including reference to Barry O'Driscoll, who resigned after 15 years as an IRB medical adviser recently directly related to the 5 minute test. "''We're going from being stood down for three weeks to one week to five minutes with players who are showing exactly the same symptoms. The five-minute rule came out of the blue. I couldn't be a part of it so I resigned from the IRB. It saddened me, but I couldn't have my name attached to that decision.''