To maximise lift and drag close to the stall making best use of ground/over water effect contribution. Flicking the odd feather would probably be enough to control the roll instability from the anhedral.
Similar to the technique used by paragliders and to a lesser extent by hang gliders on landing.
Do the ducks always touch down directly into wind?
Wouldn't it be great to be able to do that!
Does anyone know the rest of the words to that old WW2 aviators song -
"Be kind to your web footed friends
Because a duck may be somebody's mother
Well you may think that this is the end
Well it is."