C'mon guys give RB a bit of a break here, he is trying to doing some research and would really like to hear from anyone who worked with Hughes/MDD/Boeing in the design phase of the Apache.
It's an interesting q (IMHO) yes losing a TRDS would not be the event I would choose to have as my career challenging experience but loss of TR thrust (without component loss - as Bell quaintly put it) in the cruise MAY have a chance of survival and that chance would not be expanded if the flailing TRDS removed the tailboom for example.
As an apocryphal story I seem to recollect that the BV234 fatal in SUM had an unconstrained synch shaft in the equation.