He was there at a party in his honor! Sheesh, tough crowd.
Oh, but it was at a bar/club. That's where such things often are. So?
Oh, but it was late. LEOs work shift work and their parties often begin at odd hours. They often run into odd hours too, so that the shift that just got off can come. So?
Oh, but he likely drinking. Probably the crux of the matter, certainly the assumption. And if it turns out he's a non-drinker, or only had one or two? Baltimore requires its officers remain armed, apparently, everywhere all the time, even while drinking. That's old school.
Oh, but he had brass knuckles. Much will be made of this. There are more than a few old timers out there toting non-standard thumpers of one variety or another, issued or recommended to them their first week on the job. You can often times tell who; they're the one's with revolvers, though not always. The supposedly kinder, gentler ones, according to many a thread here.
Again, whatever the reason, a tragedy for the deparment and the families occured.