From the live stream: https://www.arcadiainvitational.org/eprofile.php?event_id=63&do=videos&video_id=325421
If you go to 12:19:33, you can see the anchor from Wilson started the fight.
1. He pushes Central's anchor.
2. Central's teammate pushes back at Wilson's anchor.
3. Wilson's teammate comes flying in and pushes central's teammate.
4. brawl starts.
From the video a minute earlier, it is not clear if there is any obstruction. Honestly the Wilson guy could have tripped over his own feet. For argument's sake, let's say the Central guy definitively obstructed him, it did not look intentional.
Nothing that happened warranted this escalation of violence from the Wilson runner.
I can understand why the central boys got involved because they saw their teammate was being "attacked", and then I also understand Wilson's other teammates getting involved when they see their anchor getting "attacked".
It should have stopped when others tried to break it up. The fact that they continued puts them all in the wrong, but the worst aggressor in my opinion, is the Wilson anchor.