[The mouth scowl returns in full force. Bruce seems strangely patient when he takes the Joker by the forearms and wrists and pulls the hands away from the spokes of his cowl. To be honest, the strength of the grip is not at all so forgiving.

And he doesn't let go.] Dr. Watson isn't going to do anything. He was making a suggestion, though it's a bad one. [Point made, Bruce releases the Joker's arms.]

Why do you believe it has nothing to do with the nanomachines?