Thats impossible unless if they have redesigned a new helicopter that can actually be propelled vertically without the blades.
Bingo! Finally someone who has some techinical knowledge This frame rate of this clip was reduced to 25 frames per sec. This is the astonishing result! A helicopter with no spinning blades
dam!!!...... how is it staying in the air ??? is that even possible ??!?.... the end does look like its about to crash though....
They sort of PS the whole clip to make that effect. I think for the tech details, u can PM MAV, cuz he's the expert on it.