What Dave Robson and his friends saw stood still in the sky for a while before setting itself in motion; fireflies don't do the hovering. Also, fireflies are yellow-green, were these flying lights only yellow-green, Dave? And moving with the agitated randomness of bugs?
Which reminds me, on one of my latest stay at the rural obsy I spotted a weird stationary green dot in the dark trees around the field. The light didn't move a bit, contrary to the fireflies. It looked like a laser, but kinda weak, and motionless. No one is entrenched in the dense foliage with a puny laser in hand, I thought, that doesn't make sense, and I would see him in the near-darkness.
Maybe the reflection of a diode on some shiny object stuck in a tree? Could be, the C11 building's door is open and pretty close to that foliage. There are so many diodes in there, one could reflect on a chewing-gum wrapping stuck in a tree. But on closer approach, only a tiny greenish-yellow dot hanging in front of the tree was there, with no clue as to what kept it hovering.
If it's not stuck in the foliage, how does it stay put in mid-air, attached to nothing? Walking a couple steps closer and aided by a flashlight, the truth of the hovering glow revealed itself: a dying firefly, caught in a spiders' trap, was hanging motionless at the end of a thread of twisted spider wires. Its glow faded slowly as I did my closest examination: the spider was near but let its prey loose, hanging at its torn web cause it had no longer concerns about any escape; it had already injected the poison. True to predation, the luminous insect faded to black as it died. As light was shed on this little puzzle, the bug's light dimmed to nothingness.
End of a life, of this off-topic and of fireflies stories. What Dave and his friends witnessed was not that naive a thing. Only inarticulate and vague, or quick-to-jump-to-sensational-conclusions people are that deluded, which is not the sober account he gave.
EDIT: I posted this before seeing your latest post about fireflies confusion, Centaur.
TS 8x40 Wildlife, 10x50 Marine - Fujinon 16x70 - TS 80mm triplet, 6x30 finder, EQ-3 mount, TS 2" 99% diagonal - Celestron C5+ and 6x30 finder - 5" Bahtinov - 12" GSO dob, 8x50 finder - Hyperion 24,13,10mm 68° - TS Expanse 17mm 70° - SW 7mm Panorama 82° - Ultima 2x barlow - Astronomik UHC-E filter - Baader O-III - Astro Solar 5" & 80mm filters - Sky Atlas 2000 - Rükl's Moon Atlas - Canon 400D - 5mW green laser - Restored 60/800 achro