It seems one of the Crow is a descendent of Miroku from Inuyasha, complete with Wind Tunnel and badassery. And, well, that's pretty much all that happens in this chapter.
The purpose of this arc, then, seems to be not only introducing a new Exorcist, but showing off the epic skills of Crow. First Link, now this new guy in a new uniform. By the way, the Crow with him is female. Seems for all the Vatican's misogeny in its priestly ranks, elite assassins can be of either gender. But it's the man who's really interesting here with his epic skills.
Also, that last panel is just mind-blowing. (Allen's starting to rival Kanda for Number of Times His Shirt is Destroyed. Well, it's a bit open now, but come on, I think about a million fangirls had a heart attack upon seeing that. Myself included, admittedly.)
Looks like this arc may be wrapped up in the next two or three chapters, thank god. Not that it hasn't been surprisingly good in recent chapters.