I did think about that. . . but swarms of them that small? Maybe you're right.
Saw no sheet or ordinary lightning. No clouds in the sky. No unusual aurorae.
Weird.
Nanoparticles is a viable theory, but a bit outré. My buddy was wondering about someone sticking LSD in the spa water. . . generally though hallucinations are not shared to that extent.
Fair enough, and I didn’t consider hallucinogens.
There are a wide enough variety out there that do weird enough things.
But yeah, shared visual effects puts that as “unlikely”.