Crane was in a cell and Steph was guarding him because someone was after him for Evil Plot of the Week, so she was using the chance to practise some moves Nightwing taught her. He tried various comments to undermine her ego, didn't really get anywhere. It took a page or two before she even noticed it wasn't a casual conversation.

"I thought you'd be faster at that by now. What would Nightwing say if he saw you trying to imitate him?"
"Probably give me a tip about my stance. He linked me to a few videos earlier, but physical coaching never hurts."

Matrix Dragon, J. Random Nutter