The same story as last.
[Me and my wife fed two seagulls. After a few minutes there were more seagulls. This one was warning the others - don't touch my food! It was in Croatia but that day there was no sun.]
You photographed the gull doing one of several things: making noise, gasping for breath, or getting ready to fly at that person taking its picture! You captured it is flight with clarity - not an easy task.