Kathy laughed delightedly and took off after him. And she would overtake him, too, unless he was also roughly three times faster than the average person?

She was much bouncier than he was, almost a perpetual motion machine given human form. She was also able to balance on the most precarious of perches, finding her balance within instants before leaping off to grab onto something else.

"Nice moves!" she said, giving him a victory sign once they'd reached the roof. Barry would be able to get a clear idea of Kathy's path to his rooftop; fallen dummies made for excellent trail markers. She set the three on this roof to rights, then stepped back to give them--and him--a bright grin. "I didn't know you could move like that!"