Also, when the lighting struck, it was probably not from a clear sky. And reindeer can huddle. So if they're all pretty much already touching each other...

Or even if they're not huddled, they have a sort of defense mechanism where they just running in circles when threatened.

https://www.livescience.com/64778-vikings-reindeer-cyclone.html

So I imagine a thunderstorm might elicit that response. It's just a guess though.

[–] Whats_your_reasoning@lemmy.world 4 points 9 hours ago (1 children)

I just keep watching this. It’s fascinating to see how the “eye” of the herd forms, strengthens, and moves. The individual actions of dozens, if not hundreds, of reindeer coalesce into the same pattern as a hurricane… Fucking beautiful. Thank you for sharing this.

[–] Dasus@lemmy.world 5 points 7 hours ago

You're welcome.

Ever seen murmurations?