I just came to this realization over in the TDK boards. Was this loose end ever resolved in a novelization or something? They were there for everything, they know all that Riddler discovered about Bruce. Two-Face falls to his death, Riddler goes nuts, but what happens to these two? They just kind of scamper off into the back. I usually don't obsess over holes like this, but it just happened to hit me like a ton of bricks all of a sudden.