Another beer based event?

allot of people seem to be assuming that bitter rivals is just a very literal title for the patch but i reckon its a bit of word play which signals yet more beer themed tomfoolery
from the wiki definition of bitter

Bitter is a British term for a style of beer or pale ale. The expression first appeared in the UK in the early 19th century as part of the development and spread of pale ale.

considering the berserk nature of both classes a big piss up followed by a fight seems 100% appropriate.