Bad weather, bad light, possible pressure to get the patient home................... the holes begin to line up.
Bad light ? Last light would have been around 6.08pm and there were reports of the a/c heard at 6.15pm.
If this was IFR there should have been no problem with low level scud running, so one must assume it was a VFR and what on earth was this guy thinking?
On that basis it will bring a lot of
bad light indeed on those who operate properly. Of course that is the case for everyone, from RAA to RPT.