Dalkeith is 80km away. By the time they'd returned from there, whatever had been going on in SE Glasgow was likely long over.
While it all remains a mystery, there is at least largely complete wreckage, whose damage, and the pub roof, can reveal how fast and in what orientation the helicopter arrived. With several witnesses, whose immediate and very unexpected testimony I wouldn't discount, I'm sure the investigation will succeed in establishing the events and causes.
There was fuel… but maybe it was out of reach?
The impact was hard and steep… but just how hard?
The wreckage was complete and together.
Is there anything else currently known?