"Oh, I plan to. I'm looking forward to what he's going to do next."
Because, honestly, he had no idea. There didn't seem to be a huge criminal element in Mandalus and it wasn't like the Joker was slinking around the city. Or that there were any other villains dressed in themed costumes. Blake really was stumped. He'd batsuit up when they were attacked by the Serpent, obviously. But aside from that....