Moose on Main Shooting

The shooting of bar tender at Moose on Main appears to have followed a fight. This is better than random violence, but it is bad in whole different way. I will wonder if Race was involved? I wish I did not have to wonder that, but this story leaves that out and it there are signs that it could have been an issue. The fight allegedly stated after an "unpleasant conversation" with locals. What was the conversation about? Bad service? Loud Music? What?