User blog comment:Zolnir/Flaw in Tournament Setup/@comment-5414218-20160317123214/@comment-1292715-20160318053302

Where talking about situations that happen without warning, a point you seem to be missing. Yang and Mercury were close enough that Yang attack couldn't have been stopped. And nobody, save a very specific few, knew about Penny being a robot and Pyrrha's polarity semblance, and what happened in that fight would've required the ref to have prior knowledge of them in order to react in time, otherwise they would've need time to process what was happening and by the time they figure it out it'd be too late.