Listen at the 1min mark... here the difference in the rotor... he's switched over into Throttle Hold Mode... the motor maintains a fairly constant speed and allows the rotor blades to pitch positive and negative which allows for inverted flight as well as those crazy awesome stunts... but only in the hands of a VERY good operator. That guy is indeed very good.
Incredible flying.
I have a friend who has RC plains and he says helicopters are on another level altogether, very hard to fly.
that was amazing
Just when you think you are getting pretty darn good you watch something like this and and just either put your drone back in the box or just take it straight out to the yard!!!!! That was great