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What happened when a smack talking Chicago Bears fan tried to fight a Jaguars fan after the game on Sunday?

Basically, the same thing that happened on the field.

In some pretty insane footage shot while people were leaving the stadium, you can see a Bears fan in a Matt Forte jersey (weird since he's a Jet now) talking all sorts of crap to a Jags fan.

When the Jags fan asks if he "gets down" -- the CHI fan socks him in the face. Brawl ensues. "Forte" gets kicked in the head. Crazy stuff.

We called cops to find out if anyone got arrested and the short answer -- no.

We're told police were contacted about a battery in progress that sounds like this particular fight -- but by the time they got to the area, they couldn't locate victims or witnesses.

Cops say a battery victim did file a police report later that day -- but the report was so vague and "offered no details" ... so it's unclear if that guy was in this fight.