just because somebody looks as though they've had a mild brain injury, it doesn't mean that there's not something more significant, serious, possibly life—threatening going on inside the skull. so, from that point of view, get them off the park. there are more red cards for high tackles. commentator: wayne barnes is going for his pocket. - oh, it's that one — it's red. that's a clear attack on the head. it's a red card, nothing else. and anyone suspected of taking a big hit is taken off for a head injury assessment or hia — even if they don't want to go. leaving a player with concussion on the park puts them at much greater risk of more severe injury and prolonged symptoms in recovery. rugby has advanced concussion management detection far further than any other sport. it's now extremely rare for a concussed player at the top level to play on.