"Unintentional collisions that result in people landing the wrong way, being hurt - there's got to be some wriggle room. There was a suggestion last night - if it has to be a card at all, then maybe it's a yellow and they can replace him after that 10 minutes or whatever, I don't know. But it's spoiling test matches, red cards, for unintentional incidents that are happening."
As for the potential for World Rugby to take the extreme step and ban mid-air contests for high kicks, Hansen hopes that never happens.
"Rugby's been dangerous for years," he said. "The only thing that's different is that you've now got bigger men, faster men, who are running into each other more often. We have to accept that there are going to be collisions - Ryan Crotty getting a cut head [for example]. People will unfortunately get bangs to the head - you're going to get double tackles. A lot of concussions are caused by friendly fire by their own teammates. You don't want to be red carding your own teammates.
"What we have to understand is these things are happening and how do we regulate for dirty play, and to be honest there's not much of that happening now, versus the grey stuff. Common sense has to prevail and the first part of that is accepting those things are going to happen. What are the mitigating circumstances that will allow us to stop it happening as much?
"If Beauden hadn't fallen on his head he [Fall] wouldn't have got red-carded. So what's the action, is it Beauden falling on his head or is it because they both contested the ball? I even find that strange. It shouldn't be how you fall, it should be the action which caused the fall."