wel lBatman would already be missing, which would be the pressing part, I imagine the call coming to the tower from Gordon, that theres not just a missing batman, there's a batman thats killing people. Given the chaos in Gotham, he would likely request Raven to be in charge while they're away, taking with him Supergirl, Aqualad, and Zatanna, leaving Raven, Dove, Tiger, and Terra to investigate.<br/>That would be Nightwings preference, if anyone doesn't want in on that storyarc, feel free to decline.