You cannot get dynamic rollover unless the aircraft is in contact with the ground. In the hover the aircraft is a free body in space.
But the aircraft is in contact with the ground via the rope unless of course the passenger lets go. But if he hung on for dear life trying to drag the boat or what ever and the heli pulls collective ( with the rope on the outside of the skid) or drifts to the left, how is this any different from snagging a skid on a log or rock etc.? Thus dynamic roll over. Maybe it is called a different term as once the heli drops the left skid beyond the point of getting into mast bumping while trying to stay upright, more or less the same result but with a drop plus what ever happens when one loses the rotorhead. Yikes!!