Right so this is basically the reason I joined this forum, because stuff like this keeps happening near water and nobody talks about it enough. Lakes, reservoirs, even big ponds - there's something about standing water that seems to attract these things. I've been down a bit of a rabbit hole on ley lines lately and Bristol is absolutely riddled with them, and a surprising number cross over water sources. Could be coincidence but at this point I don't think anything is coincidence.
What did it look like, was it silent? That's always the detail that gets me, the silence. A helicopter you hear coming from miles off but these things just sort of exist there without any of the noise that should come with something that size.
Genuinely want to hear every detail you can remember, even the stuff that seems boring or irrelevant, because sometimes thats the most interesting part.