The action at SoFi Stadium didn't end with the final whistle of the Rams vs. Bills game on Thursday night -- because some of the two teams' fans got into a wild brawl in the streets surrounding the venue afterward ... just feet in front of ex-NFL star LeSean McCoy!
Former Philadelphia Eagles linebacker Emmanuel Acho captured the scene on video and posted it to his social media page ... showing two L.A. fans getting into it with a man in a Stefon Diggs jersey.
In the clip, you can see the Diggs supporter threw a punch at a guy wearing a Cooper Kupp shirt -- and then all hell broke loose.