I really think if the perp had a camera, or a gas mask or something the girls would have mentioned it the recording. But police report that conversation to be what normal girls talk about. If there was something so unusual about him like a mouth camera, or dare I say a goat in his coat, or a horse halter on him. They would have said ‘look at the weirdo with a goat and respirator’ that would have been so unique the police would have quickly asked the public for tips on a perp with oxygen equipment or farm animals. Along the same lines if it was a person known to them I would think they would say to one another look at Tom, or John or Mr so n so. Why is he following. And that would have been recorded in the ‘girl talk’. Moo