Bit of a long shot but did anyone manage to get photos or video? I've had decent luck with paranormal photography over the years and I'm always gutted when a sighting like this happens and theres nothing captured to analyse properly.
Also curious whether it was completely silent - that seems to be the detail that keeps coming up with these triangular craft reports, the lack of any engine noise. Was there any light configuration, like one at each corner or more spread out along the edges? Trying to work out if this matches anything in my notes from similar reports over here in the UK.