It might be a part of a murmuration that got too close to the ground (possibly avoiding predator as already noted). Except for the blue sky background, I would wonder about a possible microburst or some other sudden downdraft, but without meteorological data from the scene, the predator avoidance seems most likely. Agree that it appears that most birds were able to move after grounding. As fast as they came down, a few casualties might be expected…
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