"We needed time to conduct an investigation. We have imposed a season ban on the young gentleman and ordered him to do the referee's course," Mr Friedel said.
"If we are satisfied he has completed the course, the season ban will be reviewed - the win-win then will be that we have another qualified referee and the young man will have learned about his mistake.
"While the season ban may appear harsh, we need the young man to understand what he has done. We just couldn't let it lie."
Rugby union administrator John Phillips confirmed the union's penalty and said he could not recall a ban of this nature in schoolboy rugby.
The under-16 game was called off early on Saturday after trouble broke out.
Mr Friedel said it appeared WHS was about to attempt a penalty conversion when a fight broke out between an opposition player and a high school player.
"Others jumped into the fray, including this young gentleman. I must commend the two coaches - they got together and between them decided to call the match off early to stop any further problems," Mr Friedel said.