Ugly.
I guess we're lucky that we missed the worst of it. You can check some of that out here, if you wish.
Here's what we do know: there are complete and total idiots on both sides of this fan rivalry. But what's also true is that a number of NYPD officers on the scene made things unquestionably worse.
As a side note, it's funny how frequently cops will try to convince folks -- journalists or otherwise -- that filming them on the job is illegal. Guess what? It's not. While I was doing my job peacefully, one officer started pushing me down the block despite the fact that I was not involved in any of the fracas, nor was I impeding his or any other officer's ability to keep the peace in any way.