"There." Cass leans forward as soon as you tap the pause on the video, pointing at the man on the screen. "See the shift." The Batcomputer's touch screen made it easy for her to rewind a few seconds, zoom in, and replay the moment, slowed down.

"He looks left and steps, but he's preparing to pull back. He's shifted his weight. A feint. See?" It seems so obvious to her, but it had been missed in the moment, and nearly got Robin a nasty whack in the head at the time. She lets you re-watch a time or two until you nod, spotting the subtle tell.

"Okay." Her turn. She thinks for a second, then frowns. "Wet behind the ears. Why?"

The two of you have been hanging out down in the Batcave, exchanging lessons. She was trying to teach you some tricks for reading body language, using old mission tapes - you were trying to help her get the hang of slang and idioms. Because spoken language can get weird. It was a thing you did sometimes, and whether either of you actually came out of it having learned anything, it made a fine excuse for some casual time together, so what more could she ask for?