"I could see his whole body convulsing. He had turned purple and they had to intubate him.
"You can't ever forget a moment like that. My son, who was only two at the time, was with me and Chris' parents and his aunt and uncle were also there."
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Chris was rushed to hospital straight from the French rugby ground before doctors later diagnosed him with a grade three concussion.
But although his condition soon stabilised, Kat revealed the devastating aftermath of what followed with a desperate message to players who have slammed rugby as "too soft" in light of the debate around concussion in the sport.
Describing the days that followed the horrible incident as scary, Kat said her husband became unusually angry, depressed, and forgetful.
"Chris was initially very groggy when he came out of hospital but the next day he was like a different person. He was distant, vague, short-tempered. He just had no patience," she said.
"He had always been such a laid back guy with the patience of a saint. This person was rude and that was so hard to deal with.
"One day I walked into the bedroom and found him sitting there just staring at the wall or the curtains. I asked him what was wrong and he just said 'I don't know. I don't know what I'm doing. I can't remember where the bathroom is'.
"I was scared. Scared about what the long-term implications of this were going to be for us all. Concussion is damage to the brain. It's irreversible"
After two months of recovery, Chris eventually returned to the pitch and now plays for the English side, Bedford, under the coaching of Cardiff rugby legend Mike Raye.
Since sharing her family's story, Kat has regularly taken to social media to address recent comments made by top coaches and players including Ellis Genge and Leicester Tigers coach Geordan Murphy.
Offering an honest perspective, Kat pleaded that people consider the human impact.
"The game hasn't 'gone soft'. More and more research is highlighting the full impact that blows like this is having not only on short-term but on long-term health," she wrote on Twitter.
"You get one brain, FOR YOUR WHOLE LIFE, and everything needs to be done to protect it.
"Fact: Every time you're concussed your brain is damaged. And it's irreversible. And you need to know that, to hear it.
"We must have this conversation."
Earlier this year, a former New Zealand rugby player with a history of concussion underwent groundbreaking testing to provide researchers with a more detailed understanding of the long-term effects of concussion on the brain.
Studies are now being carried out across the world after the findings of the NZ Rugby Health Project were published sparking public and scientific demand.
