Marsh Harrier new behaviour

in a lot of years watching Marsh Harriers I have never seen one try to take a fast moving wader from a high flying flock -- this afternoon this bird came in at about 70m and clearly headed straight into a flying flock of Golden plovers numbering about 3000 birds -- it jinked around and lashed out a foot a few times but he Goldies were easily capable of evading it though the thought was clearly there