The balance is off.

Robin makes his way through the long corridors of Slade's base, trying to identify the reason for his unease. Something is definitely up; the errands Slade's been sending him on one after the other make that clear enough -- collecting payment from Professor Chang had been satisfying, but there was something final about the arrangement that Robin didn't like. And they hadn't stolen anything in days. The base seemed almost empty without the sound of the Slade-bots in their mechanical formation; Slade hadn't begun rebuilding the numbers decimated by Nightwing.

And Nightwing -- was still there.

Entering the command room, Robin was not surprised to see that Slade's seat stood empty. Likewise the camera that should have been showing what was happening in the holding cell used for Nightwing was blank. Robin tossed Chang's payment on Slade's chair and settled down to wait. At least it should be easy now to work out which cell Nightwing was in. But how to get that information to someone who could help?