Complete with black wolf dogs, black crash helmets like skateboarders', knee pads, bullet proof vests (I think?) and sophisticated versions of M16s, NYPD's Counter Terrorism Unit is in Herald Square subway station again, ignoring the black kid doing a Michael Jackson break-dance busk with a boom box, or maybe just his ipod connected to speakers, and the waves of commuters washing around them. They're after other fish. It's the second time in a month that I've seen them. But it makes sense to see them here: Herald Square is a big midtown nerve-sensitive node, a nexus with Macy's, the Empire State, Fashion Avenue and Times Square nearby. An article from this strangely-named blog (www.pajamadeen.com) provides an explanation.