It's a safe bet both Balthazar and Horvath have plenty of unsettling habits to pick up the slack of not pulling hair. And there are always people looking to destroy the world.

Plus, if Dave stuck around, they'd expect him to destroy Morgana. Again. Maybe even twice more.

Balthazar stands up to head to the basement, then gives a soft, sputtering laugh at Dave's question. "He's familiar with the subway system, I think."

He's not going to give away the location to Horvath's bat-cave, but he can't help but be amused. And then wonder how the locations of the boy's lab and Horvath's home would match up, were they in the same dimension.