He's in a woefully misinformed 999 roleplay.
If dude was taking a class somewhere, I'm sure he would have been smart enough to have the sword in a proper bag or case.
Don't worry, it won't be long before the cops shoot him.
That implies there are cops in Detroit.
What they need is a cop that isn't limited by the weaknesses of being a human. Perhaps some kind of robot cop, but I haven't the slightest idea where they would find one, or what they would call him.