I haven't been to the Brass Rail for months, but one point some of you may not aware of: Great Mills Rd, from where it meets Chancellors Run Rd, to where it ends at RTE 5, has had a history of drug dealings.
Word had it, all you had to do was hang out at the convenience store(7-11, or something), and you could score some pot, crack or other "designer" drugs.
Seeing how close that area is to the Brass Rail suggests no surprise if a few of these "dealers" were there drinking and carrying on. Tempers flared, they "took it outside", and well the rest we've heard about.
I had been told the police had done a lot to clean up much of the drug trafficking in that area; and then again, maybe they've not quite succeeded yet.