Shreeni, Jerry.....that was just a wind-up preceding a fast and powerful flap. This is a frame following the one above.
Those kind of fast action transients is one reason why I like to keep my shutter speed high even when shooting seemingly placid and slow drifiting on the pond....from a moment to another moment that can change into a furiously fast action, such as when a Bushwhacker ( aka Cooper\'s hawk) attacked the ducks yesterday. Although I didn\'t get any good shots out of that, and I really tried, at least I was ready with my gear settings for such possible developments.