'morning... *grumbles* It's been morning for me since 3:00 AM. I need a nap. ;)<br/><br/>It's just me, but I think that the flow isn't more than a couple of feet deep. Usually, what makes noise in water are the legs moving and splashing of the knees moving. When it gets to waist level, the noise factor drops off again. Arms tend to be held out of the water, or under it at chest level, and don't make as much noise. Things under water make noise when they break the surface, unless they're big and has something making a lot of movement... shark's tail, crock's tail, things like that. Dogs swiming, for example, make little noise, as do cats.<br/><br/>The fact that Wren heard anything at all at a range of more than a few yards means that they are making lots and lots of noise... so more than one, or someone struggling perhaps.