It wasn't being knocked out cold on the rugby field that bothered former Taranaki and Chiefs player Shane Cleaver the most - it was the blows that didn't render him fully unconscious he truly feared.
"I'd be on the ground and I'd lose my legs. I'd keep getting up and fall over then I'd get back up and then I could play on.
"It's a terrible feeling. Honestly, it's a state of panic. I'd be freaking out but I'd tell myself 'you've got to get up and keep on going'. I don't know why I did it. I think it's just a bit of shock or something."
Cleaver doesn't play rugby any more. These days he works on the family farm near Hawera, where he will soon be joined by brother-in-law Craig Clarke, the former Chiefs captain. The pair were forced into retirement within months of each other, both suffering severe post concussion symptoms. At 30, Clarke was in the first year of a lucrative three-year deal with Irish club Connacht. At just 26, Cleaver's professional rugby career was just getting started.
In today's Weekend Herald Cleaver tells his story - the first player from within the New Zealand rugby system to detail his experiences of playing on through multiple concussions.