This is a “Reindeer Cyclone”.

A swirling mass of threatened reindeer stampeding in a circle making it impossible to target an individual. The weakest and fawns are in the middle.. https://t.co/QtVIvWWDzk https://video.twimg.com/ext_tw_video/1791918012603199490/pu/vid/avc1/720x900/mK1w-ivhjbmnOGRq.mp4?tag=12