Maybe to the naked eye it would have been seen as nothing more than a sudden blur, a trick of the light, but Fringe knew what she had seen when she was swinging in. That was a person, moving at impossibly fast speeds. She almost missed it herself. A blink and it was gone, but she knew what she saw. They were moving far too fast to not generate friction and appear like a ball of blinding light, but then again, powers seemed to be the easiest bowl to throw everything into nowadays. She couldn't concern herself with who or whatever that was. 

She swung high, let go, and fell to the ground with a low crouch to absorb as much of the impact as she could. "Officer, what's going on?" She questioned a nearby police officer with a tilt of her head. 

"Well, it looks like a fire." He chided. He couldn't see Fringe's face, but he could feel the overwhelming deadpan radiating off of her. "Could be arson, we can't tell at this point."

"I'll look around the area, see if I can't spot any runners."