There's a belief official 'Run it Straight' events are trying to mitigate head injuries, but has risk written all over it. 

Ryan Satterthwaite —a 19-year-old— has died after suffering a serious injury during a private version of the aggressive tackling game in Palmerston North on Sunday. 

A championship league final has been blocked from Auckland's Trusts Arena. 

Former Kiwis captain Richie Barnett told Mike Hosking the official events are a controlled environment, but heads can end up in the wrong space. 

He says it's still impact, which is the problem, as you don't need to have a concussion to have a brain bleed. 

LISTEN ABOVE 

See omnystudio.com/listener for privacy information.