I am still a beginner, and my reflex when things go wrong is to decrease the throttle rapidly. In normal mode, the pitch go to 0 degrees, or maybe a little negative and the motor decreases in power and revs too, as you go down. In idle up mode, the motor still revs fast, and the pitch goes really negative. So if I make a wrong move and I shut the power rapidly in idle up mode, I will accelerate the helicopter downward faster than gravity, a lot faster in fact. This is not good. So I am not going idle up until I am good enough to do it safely.

Georges