I thought what a great nickname for this agile & expert escape artist, namely the North American Mink.
It's usually a "now you see me, now you don't" type of scenario, particularly if the mink is not pre-occupied with fishing. Add in that body type & camouflage and it seems to disappear completely from view. And quite often, like its weasel cousin, it can pop up much further away or even more frustrating right next to you, too close for the camera lens to adjust.
So times like this, when there is a slight pause in the action, are to be cherished and appreciated. So fish on, little mink and feel free to stop by any time (and if you can, please stay a little longer).