User blog comment:Zolnir/Flaw in Tournament Setup/@comment-1292715-20160317174508/@comment-11188061-20160318023247

The fact that Weiss literally went down to minimum Aura tells you why there needs to be an extra authority on the battlefield. Suppose her Aura isn't enough to block that lava biome - she would be a burning corpse or at least severely burned at the end of the day. Maybe a referee wouldn't have been able to stop her suicidal attack in time, or maybe they would have stopped and thus cause Team RWBY to be ringed out - but in the end, it would've prevented Weiss from getting seriously hurt or even killed by accident.