Doug realized the woman was preparing to leave, so he stood up and waved. "Good luck! And if you ever need any computer savvy, come on back to Gotham. We're a terrifying and friendly sort."
He thought he was hysterical, but really, he was trying to send off as much reassurance as he could for Batgirl as for the strange woman in purple. Raven. He tried not to dwell on how pretty she was, because he was pretty sure there was a hint of jealousy in Batgirl's body language.
Surely she understood that having a reaction and acting on it were two different... no, he was pretty sure she was upset because here he was, on the rooftops. How to distinguish simply doing it to... feel the city around you, versus looking for danger? He couldn't say.
He wasn't going to give this part up. He was addicted to it. It opened up his perceptions, it let him feel like he could escape gravity, at least for a moment. It was bliss, pure and simple. She had to know that.
Until postures changed, though, he was going to be the intermediary here.