It would take one hell of a pilot to hold a copter close to the vertical wall of a building with a fuel-air fire updraft swirling up past you like a tornado, and somehow keep a platform stable hanging below you on a cable. In fact in my opinion it may not be possible. Same for trying to land and take off from the roof repeatedly. I'm actually surprised they flew as close as they did.
However, engineers are working the problem.
This background of this last photo, although not specifically labelled as such on the site, I have identified as the view out of a tower of the World Trade Center. I wish to God some of the people inside could have seen one of these hovering there like this...
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