[@Dblade26]
Well, I was actually just thinking about that. At the start of the IC, he's only been gone three days (I think) but I imagine the Riddler would be one of the first to realise that he was gone as I'm using some of the elements of the Arkham series Riddler in this; sets up traps, uses surveillance, is a pompous jackass, accuses people of cheating, etc.

So I imagine he'll have a few seconds of "I won, he's fled!" before realising that without Batman actually admitting that Riddler is the smarter of the two of them, it's an empty victory. I'm planning for him to see a member of the batfamily (probably Nightwing) saving someone at that moment, at which time to he resolves to do two things. First, find out where Batman went. Second, intellectually crush every other member of the batfamily to prove to Batman he should never have left.

Or something along those lines. It's all a bit up in the air so far.