I guess the exam setter hasn't had practical experience of the event (neither have I, fortunately!)
The last person I spoke to about his experience of a tail rotor drive failure in the cruise described the subsequent experience as being akin to a Lomcevak, with gyrations in all three axis that only eased when the SSLs were retarded. Another ex-colleague described a tumbling so violent that both crew's headsets flew off.
I accept that not all failures are that dramatic but I think to start quibling about hypothetical aerodynamic theories is misleading. There will be many simultaneous inputs and the precise interaction will vary from type to type and on the precise speed/power regime at the time.