I was listening to an interview with Gordon Smart, editor of the Scottish Sun, yesterday on BBC Scotland. He witnessed the event from high in a multistory car park. He said the helicopter was tumbling rather than a straight down plummet.
http://www.latimes.com/world/worldno...#axzz2mEcldZMm
"Gordon Smart, editor of the Scottish Sun, who was in a nearby parking structure, said he saw the helicopter "tumbling nose over tail at a huge pace" before it vanished behind the buildings in front of him."
He made it clear on the radio yesterday the sky was crystal clear and he had a full view of the incident. From his elevated vantage point he may have had the best view of the accident.