I don't get it, what ch really wants to find out.
Could it be, that he is looking for something similar like an accelerated stall in a FW?
Well, in general, helicopters just don't do this. You would have to pull back on the cyclic in a turn and that would bleed of the speed faster then you can say gobbledygook, since there is nothing that keeps pushing forward like a propeller or jet engine.
In a descending turn? I don't think so. Help me here. I can't find a combination of cyclic an collective, where one can increase the g without giving up something else. Mostly speed. Even diving and then pulling g's will not stall the rotor.
Then he talks about the numbers in VRS. Like the old crustacea said, in VRS parts of the rotordisk are stalled, but never all. Same thing goes for autorotations.
Actually, even under normal circumstances, some parts of the rotor disk may be stalled.
Then there is retreating blade stall. Also something where part of the rotordisk stalls. Part of the retreating side, that is. Something to be avoided, because it shakes the dentures lose. And parts of the ship, too.
A full stall of the rotor must be avoided at all cost. First sign will be a decay of the rotor RPM and if no action is taken, followed by an automatic folding of the blades upwards. This leads, depending on altitude, to a prolonged near death experience which will end in most cases in a full death experience. The reason of a full stall is a too high angle of attack for the whole disk, but there isn't enough power available to continue turning the rotor at normal RPM, because of the added drag. Therefore the rotor RPM will decay and the centripetal force isn't strong enough to keep the blades in their normal path. They will bend upwards and finally break.
Even the stalling a rotor sitting on the ground isn't a very clever idea. This can lead to quite a bit of flapping of the blades and lost parts, like the whole tail.
There are rumours that pilots have managed to regain control of a completely stalled helicopter, but frankly I have no reason to believe it. Wasn't there, didn't do it, didn't get the t-shirt.