The shocking incident took place on a Sydney train following the Round 24 NRL on Friday, August 21.
Footage aired on Channel 7 news shows a teenage girl in a Canterbury jersey arguing with fellow Bulldogs supporters.
The disagreement escalates and a fan in a Bunnies jumper comes to the girl’s aid before a violent physical altercation involving at least six people kicks off.
A male bystander attempted to calm the group but the brawl spilled over to a train platform and ended with this sickening kick to the head.
One teenage girl was taken to hospital after the fight which is now being investigated by police.
It is the second time this season violence has followed a clash between the Rabbitohs and Bulldogs.
Several Canterbury supporter hurled plastic bottles at referees as they left the ground after the Round 5 fixture on Good Friday, while a Bulldogs fan king hit a Bunnies supporter on the same night.