Well MarcK,
taking off at that spot doesn't make things better.
Take a close look at the video, there are solar panels on one roof, not flush on but straight on an angeled roof - perfect to catch downwash.
Do you know, how well they are secured?
About well controlled - look at the bystanders filming. When things starts flying out of control, much to close for comfort.
Gray HorizonsHeli supplies a link to interesting reading - but even there, the operator named there looks for secured areas together with the authorities for his operations.
In my humble opinion it was an unnecessary risk operating direkt out of a town.
The school ground near by looks better - an a few flying minutes away are areas without any houses/risks for operation.
Better be safe than sorry ;-)