Riddler gives a small half shrug. They might drive each other insane, it's true. While they have a lot of overlap in things they enjoy, they also need time away from one another when the little habits and foibles start to get annoying.

Oswald especially needs time away from Ed and Riddler. They can be a bit much.

"Huh. I'm... not really sure what to say. I know you missed him, but I guess you didn't really want him back here to be your reunion?"