Go to the part of the movie (the beginning), when they are crossing the stream on a log. If you listen while Heather is filming Mike crossing the log, you notice the sound is normal, with Mike's voice in the distance, as he is on the log, and Heather's voice is fairly loud, as she is using the camera. In the next scene, you notice that either Mike or Josh is filming, but their voice still sounds far off. Heather is now crossing the log, and her voice still sounds close up. If this were right, wouldn't Heather's voice be in the distance, as she is on the log where Mike was, and Mike or Josh's voice be loud, because they are now using the camera as Heather was before?