when do you call the cops?

so, the usual drunk guys across the street are fighting (it's a bunch of posturing for the most part), but one of them just pulled a large knife out and threatened to stick the guy he was yelling at. there's been plenty of screaming, swearing, and disparaging for the last 15 minutes out there. and as i'm writing this, a police van drives by, and they all get up and go their separate ways. anyway, keep your eyes peeled if you're walking on the 1800 block of first street. those harmless drunks are armed.