Sorry folks....this sounds like six guys out being drunk and aggressive and caused an Affray which under US Law is a criminal offense.
It is in the UK too SASless. Well, an offenCe anyway (You say tomato...)
In common with about 80% of criminal cases only those that were there really know the truth but fwiw I can't see much mitigation in having been racially abused when six blokes have set about one in what appears to heve been a sustained attack. You can't defend yourself against ignorance with your fists.
The knife issue. Strange. Who carrys a knife when they could have a gun? Was it a case of instant arming? The knife picked up from a table in the bar?
What it probably also has in common with many, too many of the cases I deal with is A*sehole + alcohol = violent a*sehole.