The open invitation seemed too much like a trap for the Riddler's tastes... and he was an expert on traps. And so, like Bane, he had come to the area early to scope the location out, make sure there were no police, or worse, masked crime fighters. When he first arrived, Bane was already there, doing the same thing as he was doing, but he kept his presence a secret until Bane had taken his seat.
From the balcony where the pipe organ used to be kept, the Riddler's voice could first be heard, ringing in the rafters.
"Riddle me this: why is a pencil like a riddle?" A pause. "Because it's no good without a point. And I wonder, what is the point of this meeting."
In his trademark green suit, he descended the stairs, his cane over one shoulder.