Lone,
Open thine eyes....and ears....the helicopter was inside the Pub.
Ever been next to a crashed helicopter and wondered how long the engine would continue to run? Been there...done that....and shut off the Main Fuel Switch to hasten getting the thing to quieten down.
Need I post some videos to prove my point?
Absolutely.....the Bar Patrons inside...would never hear the Engines outside....but that was only half the situation in this case as the Helicopter wound up smack dab in the middle of things inside the Pub.....and after the crashing of Timbers and the Band shutting down....there is a good likelihood someone would have heard the Turbine Engine(s) if they were still operating.
As I noted....there are numerous reasons why they would not be running post Crash....but whether they were or were not is relevant to the investigation.
I am merely stating there is no evidence in the public domain that indicates they were running.....thus the assumption can only be they were not.
AAIB will tell us one day with some certainty whether they were or were not operating.....I hope.