"Witness on MSNBC said that it didn't look like the copter or plane was aiming for the building, but appeared to be in distress and striking more of a glancing blow. Was descending at a steep angle, with an odd noise."
This is what an auto-rotation looks like.
Helo may have lost power or tail rotor.
We were told that Charles Bishop's plane crash was "accidental" too even though he called it a terrorist act in his suicide letter.
I even remember the nut in the Cessna who fired on Boston one night back in the 1980s.
Like if a muzzie had taken the copter hostage. And had presented plan A as premise, only to have it dawn on pilot/passengers that plan B was playing out....