Mate the tree line detail is what gets me every time - that's basically a classic staging point for whatever these things are, I've logged three separate sightings near woodland edges in Aberdeenshire alone and the pattern is just undeniable.
What colour was the light? And did it make any sound or was it that specific heavy silence that feels almost pressurised, like your ears want to pop? That detail separates 90% of genuine reports from the mundane stuff in my experience.
Also - did any animals go quiet beforehand? Asking everyone this now because I'm building a dataset and the correlation is starting to look very interesting. Drop as much detail as you can remember, even the stuff that feels daft to mention.